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- Rika persuades Satoko to ask for help and she is freed from Teppei. Just when the village seemed to be relieved from its eternal cycle of hatred and death, the real enemies start to act, just like they did in previous worlds.
- Satoshi apologizes to Shion , and asks her to care for Satoko during the Watanagashi festival. Satoshi murders his aunt the night of the festival for abusing Satoko. Shion is suspicious that he is the culprit, but provides an alibi for him when detective Oishi questions him. In the process she reveals that she isn't Mion, but her twin sister Shion. Shion's family finds her when Oishi checks out her story, and she is taken back to their family estate to answer to her grandmother for the trouble she has caused. Satoshi is missing after these events.
- Shion captures the village head and gets information about the previous murders and Satoshi. Shion confronts Rika about the murders, leading to a confrontation between the two. Shion injects Rika with the syringe that Rika had brought for her. Rika commits suicide by stabbing herself repeatedly in the head. Shion invites Satoko to her house.
- In order to save Satoko, who is terminally infected with the Hinamizawa Syndrome, Rika offers herself as a test subject for Irie and Takano's research. More light is shed on the deaths of Satoko and Rika's parents, and how the deaths are related to the legend of Oyashiro-sama's curse.
- Rika shows knowledge of Keiichi's actions on the night of the festival, and in a metaphorical conversation promises to help the 'little kitty cat who did something bad' on the night of the festival by making the 'big dogs' aware the 'kitty cat' had no bad intentions, and alludes to the fact that Mion is angry with Shion over what happened. She also warns Keiichi that if the same 'dog' who bit the village leader tries to bite him, he should tell her. That night Keiichi learns the village leader has gone missing. Shion tells Keiichi that she confessed to the village leader about what they did. Shion thinks it's her fault that Oyashiro's Curse got him because he had promised to help them. Keiichi believes Rika is also in danger. Keiichi, Rena and Mion go to Rika and Satoko's home to find them, but they have gone missing. Keiichi talks with Detective Oishi. His account of the village leader's activities before disappearing contradict Shion's claim that she confessed. Shion has been missing ever since the festival. Shion calls Keiichi that night, and he confronts her about who she really is. He hears maniacal laughter before she hangs up the phone.
- Akasaka and Oishi find the kidnappers' hideout and rescue the kidnapped boy. They discover that their efforts were in vain because the perpetrators' demands had already been met. He realizes the real meaning behind Rika's words.
- Influenced by Keiichi's encouragement, and the fact her friends are starting to avoid doing the same mistakes again by remembering glimpses of what they could have done, Rika decides to find a way to prevent her own ominous destiny.
- Keiichi goes to the Hojo residence to ascertain Teppei's status and finds Satoko in need of medical help. At the Furude Shrine, Keiichi discovers Rika's disemboweled body. Satoko believes that Keiichi is the culprit and flees. Satoko comes to the conclusion that he is possessed by Oyashiro. Keiichi fruitlessly tries to convince her otherwise, and Satoko forces him off a bridge. Disaster strikes the village of Hinamizawa: a gas leak kills thousands of residents. Keiichi survives the fall from the bridge and the gas leak.
- During a picnic with Keiichi, Rena accidentally swallows one of the mysterious "Fuwazaru Magatama" which falls from the sky, and begins acting lovesick. Rika explains that the seal on the magatama has been broken, and that whoever possesses the red magatama will fall blindly in love with anyone holding its white counterpart. Everyone reasons that Rena must have swallowed the red magatama and sets out to stop her and find the white magatama. It winds up in the possession of Tomitake, then Takano, and finally Oishi, each of whom gradually come to accept her love under the magatama's curse. Keiichi manages to obtain the magatama after beating Rena and Oishi with Akasaka in a game of mahjong. Oishi fumbles it and Keiichi ends up accidentally swallowing it as well. Rika lifts the curse before Keiichi can fall under its power, and Rena returns to normal. Rena, who is grateful to Keiichi for helping her, expresses her feelings toward him, though she isn't sure if it's part of the magatama's power. Tomitake and Takano still appear to be infatuated with Rena and fight over who gets to keep her.
- Shion believes the Sonozaki family is connected to the acts of "spiriting away" people in the village, especially in the case of Satoshi. She imprisons Mion in the dungeon and unintentionally kills her grandmother. Shion pretends to be Mion the next day and confronts Keiichi about the previous night's encounters, which Keiichi still denies.
- Tomitake is captured. Irie rushes to escape and ends up meeting with Shion and her bodyguard, Kasai, on their way to the Sonozaki estate. By accepting their help, he ends up unintentionally revealing Rika's hideout to the enemy, via a transmitter hidden in his lab coat.
- Rika tells her friends the truth behind the Hinamizawa Syndrome, and her connection with it. Meanwhile, the enemy moves on with their plan, eliminating any opposition .
- Hanyu watches silently and hopelessly as the cruel events occur during the dam incident. She and Rika eagerly await the arrival of the one person who will be the key to bringing an end to the enemy's intentions.
- Takano's past is revealed in disjointed flashbacks, some of them showing her harsh childhood, while others show the time when she became involved with researchers of the Hinamizawa Syndrome.
- Rika becomes torn between remaining in this new world that knows no sin and where everyone is living contently, or killing her mother and returning to her old world. She learns that she does not have much time to act. Rika decides to fight for what she wants to live for. The next thing she knows, she awakens from a coma in her old world and happily reunites with her friends, the other world having apparently been a dream. Rika concludes she must have killed her mother to regain consciousness. Unbeknownst to her, the dream was developed by Hanyuu to teach Rika that people need to work past personal hardships in order to make life worth living.
- Four years ago, during the dam incident, young police investigator Mamoru Akasaka comes to Hinamizawa to investigate a child kidnapping. He hears an enigmatic warning from a younger Rika and becomes suspicious of some of the townsfolk.
- Takano's story continues, showing how she met her foster grandfather, and her determination to continue his work. A few years later, Takano and Hanyu have a very heated confrontation at Oyashiro-sama's shrine.
- Keiichi decides that he must kill Teppei. He beats him to death with Satoshi's baseball bat and buries the body. On his way back home, Keiichi bumps into Takano.
- Rika begins a new world with Hanyū. She is getting tired of seeing her friends commit the same acts that lead them to terrible mistakes. Keiichi proves to her that people can change their fate if they want during the game tournament, like the one in Watanagashi-hen. He gives the doll he won as a prize to Mion instead of Rena. Rika thinks that this world may be different.
- Keiichi's parents leave for Tokyo for a few days. Helped by Satoko and Rika, who make dinner for him, Keiichi learns about Satoshi, Satoko's older brother, and his mysterious disappearance on the night of last year's Watanagashi festival. He decides to act as a surrogate brother to Satoko and investigate Satoshi's disappearance.
- Keiichi learns about the curse of Oyashiro. During Rika's ritual performance at the Watanagashi festival, Shion whisks Keiichi away to sneak to the ritual tool shed of Oyashiro, where Tomitake and his friend, Miyo Takano, are waiting. Tomitake stands guard while the others look inside. They find dozens of torture tools. Takano explains the significance of the ritual tool shrine and the Watanagashi festival. Her theory is that the villagers of Hinamizawa are continuing an age-old tradition of sacrificing people to Oyashiro. Shion and Keiichi promise not to tell anyone they entered the shrine. Keiichi becomes disturbed when he is questioned both by Mion and Detective Oishi about the whereabouts of Shion, Tomitake, and Takano on the night of the festival. Keiichi learns from Shion that Takano was found burned to death and Tomitake committed suicide by clawing at his own throat. Keiichi starts to wonder about Shion's safety as well as his own.
- Rika makes contact with Hanyuu, who tells her that for her to return to her old world, she must find and dispose of a piece from her old world that prevents Hanyuu from entering this new world. This is what prevents Rika from reincarnating. If this piece turns out to be a person, for instance, she must kill that person. She is initially eager to find the item and return to her old world, especially when she responds to Satoko's bullying by assaulting her. Shortly afterward, Rika experiences what life with a mother is like, and begins building a new friendship with Mion, Rena, and Satoshi, as well as making peace with Satoko. Rika now feels it's all a matter of deciding which world she would rather like to stay in until she learns that her mother, now the reincarnation of Oyashiro instead of Rika, is the item she must dispose of.
- While studying Takano's scrapbooks, Rena discovers that Oyashiro, who is worshipped by the Three Families that run the village, doesn't actually exist. She discovers that the problem is a virus causes its victims to go berserk. This disease caused all the murders. As a result, she is being hunted down by people who appear to stop at nothing to keep this information a secret.
- When Satoko is absent from school for a few days, Keiichi discovers that it is because of Teppei, her abusive uncle. He left Hinamizawa after his wife was murdered on the night of last year's Watanagashi festival, and has only just returned to town. Keiichi intervenes.
- Keiichi is shaken when his friends tell him that he was actually at the Watanagashi festival with them. Satoko's uncle is still abusing her, though Keiichi thought he had killed him. He gets even more confused when he unsuccessfully tries to find the truth.
- Rika's friends are killed while trying to protect her. Takano kills Rika without anesthesia in an attempt to carve the identity of the culprit behind all the Hinamizawa murders into her mind and thus prevent the events from this and past worlds from repeating themselves. The villagers are rounded up at the school and gassed to death, while an ecstatic Takano proclaims her ascension to godhood.
- During the annual Watanagashi festival, Keiichi is informed by Tomitake and a mysterious woman, Takano, about "Oyashiro's curse". A series of murders and disappearances has occurred on the night of the festival for the past four years and are all supposedly caused by the curse of Hinamizawa's guardian deity, Oyashiro. The next day, Keiichi is interrogated by a police detective, Oishi, and learns that Tomitake committed suicide by clawing out his own throat, while Takano has gone missing. He becomes Oishi's informant. Keiichi notices changes in Rena and Mion's behavior and suspects them of hiding something from him. He too is accused of keeping secrets because of his ties to Oishi. Keiichi delves deeper into the history of the curse with Oishi, and learns that one of the victims was Satoshi, a boy who had apparently transferred out of school in Hinamizawa before Keiichi arrived. At that point, Keiichi realizes that Rena has been eavesdropping on him the whole time.
- Shion tricks Keiichi in a phone call and later tricks the townsfolk into believing Keiichi a murder suspect. She quickly realizes that Oishi suspects her instead. She brutally murders Satoko, who she has been holding captive. Then she remembers to her horror that one of Satoshi's last requests was to keep Satoko safe.This drives her deeper into madness. Shion lures Keiichi to the dungeon and tortures him. She knocks him out with her taser. Mion tells her that their grandmother may have approved of Satoshi. Shion switches clothes with Mion and pushes her down the well. She and Keiichi are rescued. Shion starts to hallucinate. She visits Keiichi and gravely wounds him. Shion hastily returns to her apartment by scaling the side of the building, and slips and falls to her death.
- The fight to save Satoko from her uncle's abuse continues. She is reluctant to denounce him, for her own reasons. Rika realizes that she is the one who must take action.
- Growing increasingly paranoid, Keiichi calls in sick for school to avoid his friends and delve deeper into the mysteries of Hinamizawa. Oishi takes Keiichi to Angel Mort for lunch, and he tells him that all of the victims of Oyashiro's curse are related to his group of friends. That night, Rena and Mion visit Keiichi and give him a box of ohagi as part of a club activity. One of the ohagi contains a needle. Keiichi is convinced that that Rena and Mion are out to get him. Keiichi arms himself with Satoshi's baseball bat when he returns to school the next day. His friends reveal that Satoshi had displayed similar paranoid behavior before he disappeared.
- The day of the Watanagashi Festival comes, and Rika fails to warn Tomitake of his imminent death. Satoko is convinced that a mysterious man is following her and Rika around. Worried of Rika's safety, Satoko sets traps around the house to alert her of any intruders, and when one is triggered, her fears are confirmed.
- False information regarding Rika is spread by Oishi's group at the precinct. The villain's crew is left in disarray, racing against time to prevent their plans from being foiled.
- Rika's plans are hindered by the appearance of Teppei, who much like in Tatarigoroshi-hen, begins to abuse Satoko. Keiichi and the rest of the gang decide to find a way to release her from his clutches, but the government is reluctant to cooperate.
- Rika gathers her allies and start to make plans, while obtaining more information about the enemy and those supporting their ambitions.
- More details about Satoshi's past are revealed, including the reason for his disappearance. Rika and Hanyu make their final preparations for the impending struggle against destiny.
- Keiichi discovers Mion has an identical twin sister named Shion. Keiichi also discovers that Mion has a crush on him, and so does Shion.
- Now that she and her friends are finally free from the eternally repeating tragedies of June 1983, Rika has a new lease on life. While biking with her friends, Rika carelessly collides with an oncoming truck and is apparently killed; when she awakens, she finds herself in another Hinamizawa. However, this world is quite different from other worlds in the past: Keiichi, Takano, Irie, and Hanyuu are nowhere to be found; she is no longer close friends with anybody. Satoko is particularly hostile. The dam project that threatens to flood the town is still underway and none of the successive tragedies she witnessed countless times happened at all, meaning Satoshi and her own parents are still around. For the first time in her life, Rika has no idea what to do.
- Hanyu is introduced into the world as a transfer student to the Hinamizawa school, but forgets her role. After a brief meeting with Takano and Tomitake, she remembers the past worlds and informs Rika about the enemy's intentions.
- Rena pays Keiichi a visit and begins acting strangely, prompting Keiichi to succumb to his paranoia and hurt her. Distressed by Keiichi's behavior, Mion attempts to apologize for keeping so many secrets about Hinamizawa from him, but he coldly rebuffs her. Later, Keiichi is being followed by Rena. He demands to know who caused all the murders and disappearances; Rena simply replies that it is all the work of Oyashiro. Keiichi escapes from Rena and finds himself being chased by a mysterious group of men, who knock him out. When he awakens, he is subdued by Rena and Mion, who attempt to inject him with a syringe. In self-defense, Keiichi beats Rena and Mion to death with Satoshi's bat. He calls Oishi and tells him the murders were caused by Oyashiro, and then Keiichi, who is sure that Oyashiro is behind him, claws out his own throat. The next day, Keiichi is found dead. The police also find the bodies of Mion and Rena, and they find out that Keiichi was the one who killed them.
- Irie, Akasaka, Kasai, and Shion head to the clinic to rescue Tomitake. Irie reveals Satoshi's location to Shion. The others deal with the enemy assaulting the mountains.
- Satoko worries about Rika's depression and tries to help her, but Rika denies that anything is wrong. In the middle of the night, Satoko is woken by Rika arguing with a mysterious voice telling her she will soon be murdered, and that there is nothing that either of them can do.
- The rest of the Yamainu concede defeat, but Takano is unwilling to surrender. After learning Nomura in Tokyo planned to use her as a scapegoat, she flees into the mountains and has a final confrontation with Rika's group. The Banken come to arrest her. Tomitake pities her when she sees she had been infected with the Hinamizawa Syndrome, takes her into the Irie Clinic for treatment. Rika and her friends Hanyu, Keiichi, Rena, Satoko, Mion, and Shion, attend the festival. After the credits, Frederica Bernkastel manages to change Takano's destiny by preventing the death of her parents, thereby giving Takano a happy ending as well.
- With her madness at its peak, Rena holds her friends and schoolmates hostage and threatens to kill them all with a homemade bomb planted on the roof of the school. Working together with the police and his friends, Keiichi defuses the bomb. Keiichi and Rena have a final confrontation on the roof, Keiichi armed with Satoshi's bat and Rena with her cleaver. Rena gradually regains her sanity until she defeats Keiichi, though she is unable to bring herself to kill him. Rena reconciles with her friends. Though tragedy has been averted through Rena's atonement, the constant time loops have yet to lift; however, there is now hope for the future.
- Rena confronts Rina about their plan scam her father. Rina tries to kill Rena, who slashes Rina's belly with a shard of glass and beating her to death with an old pipe. Rena witnesses Teppei putting his and Rina's plan into motion and splits his head open with her cleaver. While disposing of the bodies, she is caught by her friends who, to her surprise, offer their unwavering support to keep the incident a secret.
- Rena meets her father's girlfriend, Rina, who turns out to be working with Teppei. When she learns that they plan to rip off her father, Rena forms a deep hatred for them and plans revenge.
- Rena learns that Mion moved the bodies from where they originally hid them. Rena's faith in her friends is shattered and she begins to go insane. Keiichi tries to stop Rena, but she confronts him with his own dark secrets. He confesses his past sin to his friends, and finds that he can recall events from Onikakushi-hen, particularly his own paranoia and murder of Rena and Mion. This strengthens his understanding of Rena's situation and he resolves to prevent such tragedies from occurring again. He apologizes to Mion.
- Shion finds out Satoshi has is missing and decides to investigate further into the mysterious murders over the past four years. Shion meets Takano at the library. Takano tells her more about the history of Hinamizawa and its dark past. The story skips ahead one year to the present. Keiichi brings back memories of Satoshi to Shion.
- Back in June 1983, the club participates in a game of "zombie tag". On their way home, they run into Irie, Tomitake, and Takano, who tell Keiichi about the yearly murders known as "Oyashiro-sama's Curse". He understands why his friends hid it from him and doesn't resent them for it. This fails to reassure Rika, and she grows progressively more depressed as the day of the Watanagashi Festival approaches.
- Keiichi's struggle to help Satoko forces him to confront the village elders and the leader of the Sonozaki family. As the government succumbs to the pressure of Keiichi and his allies, Satoko's condition deteriorates.
- Much to Satoko's surprise, Rika hides her. Rika is taken away and killed. After witnessing Rika's demise, Satoko flees and falls off a bridge. Satoko stumbles back into Hinamizawa in the aftermath of the Great Hinamizawa Disaster. The trauma of witnessing the remaining villagers' deaths drives Satoko into mental shock. In the hospital, Oishi tries to bring Satoko out of her catatonic state to interrogate her. He relays a cryptic message left by Rena that hints at the motive behind Rika's murder. Satoko regains consciousness and realizes the meaning of Rena's message. She is killed by Rika's murderers.
- The events from Watanagashi-hen are retold from Shion's point of view. For generations the Sonozaki family has murdered the youngest of newborn twins as they are seen as bad luck. When Mion and Shion are born, they decide to send Shion away to boarding school. Shion escapes and returns to Hinamizawa with the help of her caretaker, Kasai. Shion pretends to be her sister and gets a job with her uncle. Shion learns about Oyashiro's curse from Mion and the mysterious deaths. Shion meets Satoshi, a classmate of Mion's, who mistakes her for Mion. Shion takes a liking to Satoshi. Satoshi is a member of the Hojo family, and his parents were victims of Oyashiro's curse for supporting the construction of a dam that would have flooded the town. Satoshi and his younger sister, Satoko, were taken in by their aunt and uncle after their parent's death. Their aunt and uncle resented them because the rest of the village shunned them for their parent's support of the dam. Shion goes to school in Mion's place in order to try and cheer up Satoshi. When she fails she takes out her anger on Satoko, who she sees as the root of Satoshi's problems. She beats Satoko up. Rika, Rena and Satoshi try to stop her. Shion learns Satoshi despises her family.
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