Arc 4Yū's Rise and Reforms
Namikawa Yū became Uchiha Clan Head and Third Hokage, reorganized Konoha's education and finances, and fought the Kinkaku Brothers alongside the Third Raikage. He developed a living vessel for part of the Nine-Tails, then turned his attention to Konoha's students as Tsunade and Orochimaru excelled in their examinations.
- Namikawa Yū won Uzumaki Mito's support, took the Uchiha Clan Head position from Uchiha Kawaaki, and was elected Third Hokage with backing from Konoha's major clans.
- Yū shared the Daimyo's funds with the clans and introduced village-run businesses, compulsory academy education, and an Intermediate Ninja Academy with contributions from several clans.
- Yū and the Third Raikage joined forces against the Kinkaku Brothers, and Yū defeated Kinkaku while the Raikage killed Ginkaku.
- Konoha and Kumogakure negotiated an exchange involving the Amber Purifying Pot, compensation, and the bodies of Senju Tobirama and Ginkaku, while Yū rejected Shimura Danzō's proposal to attack the Uzumaki Clan.
- Yū examined the Kinkaku Brothers' and Hashirama's cells, then persuaded the Nine-Tails to provide flesh and blood for an experiment.
- Yū transferred part of the Nine-Tails' consciousness into a young fox body, and the Nine-Tails agreed to stay with him as it grew stronger.
- Yū reunited with Tsunade, met her classmates, and offered promising students the chance to assist in his laboratory.
- Yū reviewed the advancement results, where Tsunade ranked first and Orochimaru second, while Jiraiya placed near the bottom and Hiruko followed him.