Arc 23God Trees and Demon Slayers
Tetsuya and his companions hunted an Ōtsutsuki on a drained planet, refined its God Tree Fruit into pills, and returned to the Shinobi World before setting out to aid the Demon Slayer Corps. After Izuna returned and Tanjiro completed his training, Tetsuya and Izuna joined Tanjiro, Zenitsu, and Inosuke on their way to the Mugen Train.
- Tetsuya led Madara, Hashirama, Izuna, and Jigen across marked planets in search of Ōtsutsuki, and the group found that one world had already been drained by a God Tree.
- On Planet 14, Hashirama and Izuna fought Ōtsutsuki Shiki while Tetsuya, Madara, and Jigen inspected the God Tree and found that it had consumed the planet’s inhabitants.
- Hashirama and Izuna defeated Shiki, and Tetsuya sealed him before refining the God Tree Fruit, the tree, and Shiki into four pills that strengthened the group and restored the land.
- Tetsuya returned to the Shinobi World, learned of its changes from Shinada, and visited the Research Department, where Hashirama named Tobirama’s artificial child Senju Yūki.
- Tetsuya postponed the next Ōtsutsuki hunt when Husky alerted him that Muzan had defeated Izuna’s clone, then returned with Izuna to the Demon Slayer World.
- Kagaya approved Tanjiro and Nezuko’s arrangement with the Corps after Nezuko resisted Sanemi’s blood, and Tetsuya brought the supposedly fallen Izuna back to the Hashira meeting.
- Izuna briefed the Hashira on Kokushibo and Muzan, while Muzan dismissed the Corps’ response and stopped pressing his demons to pursue them relentlessly.
- After Tanjiro recovered and received orders to investigate the Mugen Train with Zenitsu and Inosuke, Tetsuya and Izuna joined them, and Tetsuya offered to explain how Flame Breathing related to Fire Breathing.