| abstract | - Saimei is the youngest child of Hamura Ōtsutsuki after the Kaguya and Hyūga clans' ancestors. Like her brothers, she chose to stay on Earth when Hamura decided to move to the moon to guard Kaguya's remains. However, around her teenager years, Saimei fell in love with a prince from the western continent, and much to her own happiness, her feelings were returned. The prince then invited her to his court in the western continent, which she gladly accepted. Saimei lived in complete happiness and bliss for some years with her prince, eventually being crowned Empress once the prince ascended to the throne. However, a group of people unhappy with the empire had managed to obtain chakra and weaponized it to rebel against the royal family. During a raid to the royal palace, Saimei's husband was tragically slain by the rebels while trying to protect her. Saimei, upon witnessing her lover's death, unleashed her wrath on the enemies, her Ōtsutsuki chakra far outmatching that of her foes. It was then she discovered her peculiar and unique ability to absorb one's entire soul and chakra, integrating them into her own. With the emperor's death, Saimei assumed the throne, but more shinobi rebels started to amass armies, and soon enough the whole empire erupted onto a massive war that devastated the continent. However, the Ōtsutsuki empress used her unmatched power to quickly snuff out all the shinobi rebel groups. After the war finally subsided, Saimei grieved greatly at the destruction and suffering brought upon by the use of chakra. She recalled the stories about her grandmother told to her and her siblings by their father, and how she gained god-like power to end all wars and bring about an era of peace. Saimei now desired to follow in her grandmother's footsteps, but in a different way. She was aware from her father's stories, that Kaguya eventually became selfish and arrogant, simply wishing to possess the gift of chakra all for herself and using the Infinite Tsukuyomi not for the people's happiness, but to submit them to her will. Saimei on the other hand, truly wished to see the world's inhabitants eternally happy. For this end, she was willing to "erase" the current already corrupted world and begin one anew under her full celestial surveillance. Saimei planned to obtain her grandmother's power and take as many souls as she could with her to the new ideal world. As such, after absorbing all the souls of those fallen in the war, Saimei infused her own juinjutsu on select few individuals and entrusted them with the rebuilding of the empire for the ushering of the new world. She then departed back to her native continent. In order to obtain Kaguya's divine power, Saimei needed to use her gift and reunite most of the chakra descended directly from her grandmother, this meaning she had to absorb the chakra of Hagoromo and Hamura. Since her father was now out of her reach, and with the Sage already deceased by this time, the alternatives were her own brothers and cousins, Asura and Indra. She tried to convince the Hyūga Clan's ancestor first, seeing him as more reasonable than their elder brother, to offer his soul to her. However, he declined her request and called her plan for a new world insane. In midst of painful tears, Saimei caught her brother off guard and forcibly drained him of his chakra and soul. She sought Hamura's eldest child next, begging him the same sacrifice as their middle sibling. Her request was once again declined, and this time she wouldn't get away without a fight. The naturally stronger man wielding the Shikotsumyaku kekkei genkai almost defeated Saimei, if it weren't for her abnormally powerful chakra fueled by the many souls she had absorbed by then. In the end, she managed to relieve the Kaguya Clan's ancestor of his chakra and soul as well. After obtaining both souls and chakra from her siblings, Saimei had now obtained a similar power to her father, and was able to summon his shakujō for her own use shortly after her father's death. Next, she went after Hagoromo's sons, encountering Asura first. Despite Asura declining her request as well, he offered to help "fix" the current world instead. Saying there was no salvation for the current world since humankind had started to weaponize chakra, Saimei still insisted in obtaining Asura's soul. This would eventually escalate to a battle between the two, where Asura would have lost if it weren't by Indra himself interfering. Learning about Saimei's abilities and her power increase after absorbing her brothers' chakras and souls, Indra said they could only stop her with a seal. After a long grueling battle, the brothers finally managed to defeat Saimei and succeeded in sealing her by using their chakra in conjunction with a sealing artifact in a nearby underground shrine.
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