| abstract | - Onwa born around the same time as Kakashi Hatake in Tobikakurenai. In her time at academy she showed great skills in controlling defensive ninjutsu, but she was one of the worst in her class when she had to use a genjutsu. Even having difficulty with such techniques in particular she passed with good grades when she did her test to become genin. She was not the best in the class, but was above average in all subjects (even genjutsu because she was very good in the theoretical part). She, along with Iwaburo and Mo Yamakaze were part of Chika Taisuisō's team , an experient jōnin who had participated in the Second Shinobi World War, when he had commanded Tobikakurenai's medical platoon. Seeing that Onwa possessed peculiar defensive ninjutsu abilities, he encouraged her to study about medicine while training to strengthen her offensive jutsu and also her taijutsu and genjutsu. Since then, Onwa became Chika's particular apprentice and after that her skills became so extraordinary that at eighteen she had already surpassed her master and was not only better than the Konoha's Slug Princess, Tsunade. Because of such skills and fame, Onwa became known as the . While studying about medicine ninja, Onwa realized she had a different color on her chakra than her mates. So she asked to the Third Tobikage if he knew why such a singularity. After successive tests and some experiments with her chakra, Onwa discovered that she had a peculiar Kekkei Tōta, the Purification Release, which would enable her to develop new techniques that could complement her medical work. The discovery of such skill awakened in Chika a greater interest on the skills of his pupil. Onwa and her sensei were ordered by the Tobikage to lead Tobikakurenai's medical platoon during the Third Shinobi World War. During the almost uninterrupted fighting between Tobikakurenai and its enemies (mainly Kirigakure and Takigakure) Onwa had to use all her medical knowledge to assist the most of their allies. With her sensei and partiular master's help she improved her skills at each treatment. Because of the number of Tobikakurenai's shinobi and the importance of each battle, Onwa was forced to separate from Chika and lead alone more than half of the medical platoon which headed to the Land of Hot Water where a group of Yugakure shinobi could help to sabotage one of the main plans of Takigakure if received in exchange medical help because all their medical-nin had been killed during the last attack they suffered. However, Onwa's platoon was surprised by a trap set by Takigakure's shinobi who had killed Tobikakurenai's allies and armed hundreds of explosive traps against its enemies. Even wounded and weakened, Onwa began her work as a medical trying to cure the most of her men. Using all her knowledge in medicine, her unique abilities created from her Kekkei Tōta and a lot of willpower, she was able to save all of her subordinates, even if at the end of this performance she had fainted because all her reserves of chakra were exhausted and all the gauze she had was over. Since that day, she was recognized as one of the world's best medical shinobi, and then began to be called Twin of Tsunade. At nineteen, Onwa was invited by her sensei to experience some new medical techniques that could make her surpass Tsunade as the number one medical-nin of the world. For weeks they trained and studied in the laboratory that Chika had in the Land of Rain. Most of the experiments and practices required a high degree of expertise in advanced medicine, great control over her chakra and (many times) cold blood because they were required to dissect cadavers. Initially Onwa believed that such demands were the price to pay for progress (this idea was repeatedly stimulated by Chika), however, as the training progressed, Onwa began to suspect from the ideals of her sensei. When she decided to leave the training, Chika became aggressive and forced her to continue. So, he revealed to his student that such training that they were performing were of Dark Medicine, and that once their studies were completed they would leave the village and become allied to Amegakure in order to begin a mass training of medical-nin specialized in Dark Medicine. Even in captivity, Onwa repeatedly tried to communicate with her village, but all attempts were thwarted by Chika and other shinobi from Amegakure who were ordered to protect the lab. The following night that Onwa managed to defeat two of the guards and send a letter revealing the true identity of her sensei, Tobikakurenai shinobi and even the Tobikage invaded the lab with an arrest warrant against Chika. Even if the best ninja in the village had been called, Chika used his secret jutsu and the Dark Medicine to defeat most of the shinobi and let the Tobikage seriously injured. Shortly before leaving the laboratory in an attempt to reach to Amegakure, Chika was surprised by two of his pupils that awaited him for a battle. Onwa never revealed what actually happened during that battle for anyone, the only people who know the truth are the Tobikage, since even Iwaburo was unconscious after facing Chika. The official version that was passed in the village was that Onwa used the Ravines Final Doom Technique in Chika and then sealed the skills of the master and than months later Chika had committed suicide because he was disgusted with the fact of not being able to perform any techniques. However, there is a rumor that, using the same technique, Onwa had killed her sensei because she believed that he was too dangerous to remain alive, even unable to perform any jutsu and could pass his knowledge on Dark Medicine to other shinobi. This rumor was never denied, although there are efforts to make it not be disclosed or mentioned. Currently Onwa threat slap and kick with force anyone who ask her about what happened. Years after overcoming her kidnapping and her sensei's betrayal, Onwa was designated by the Tobikage to take a team of new genins from the village. Onwa lead the Team 5 which had three very unique and special children: Sokai, a shy young boy who liked to listen to music all the time who had great skills with ninjutsu; Miyuki Hisajima, a kind, intelligent girl, skillful with long-range attacks and who Onwa noticed a tendency to be able to become a medical-nin and Himitsu Yumekuni, a member of the famous Yumekuni Clan with a diverse knowledge in genjutsu. Train the Team 5 was not easy, but they soon gained recognition and fame as the Tobikakurenai's Strongest Team. However, during the Attempt of the Land of Wood, the team had to be scrapped when Miyuki was seriously injured and can not continue life as shinobi. Onwa blamed herself for months for not having prevented her pupil to fight and also for failing to cure her. Still, Miyuki always considered her the world's best sensei and never blamed her because of her accident.
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