Arc 8Sage Mode and the Front
Kōki defeated Iwagakure’s Jinchūriki and learned Sage Mode in Shikkotsu Forest. As Kōki left to reinforce Konoha’s failing Kumogakure front, Ōnoki hired the Light Organization to pursue a mission after losing Roshi.
- Kōki returned to the Iwagakure battlefield and routed its forces, earning the name Green Demon, while Jiraiya learned of the Light Organization and its mysterious attack on Kōki.
- Aizen recruited Fujimura Kasen, Koizumi Kana, and Chimori Akira as peripheral members, then secured an agreement with Rōran to use the Dragon Vein in exchange for protecting the city.
- Ōnoki sent Roshi and Han to fight Kōki, who defeated both Jinchūriki and suppressed their Tailed Beasts, though Iwagakure retreated with Han and Konoha kept Roshi prisoner.
- Kōki sent Roshi’s blood and tissue to Aizen for research, then asked Katsuyu to teach him Sage Mode in Shikkotsu Forest.
- Kōki rapidly mastered natural energy, developed an improved Sage Mode, and learned chakra fusion principles from Katsuyu the Sage, who warned him about its dangers and limits.
- Hiruzen ordered Kōki to take troops from the Iwagakure front and reinforce the Kumogakure front after Kumogakure’s Tailed Beasts routed Konoha’s forces.
- Kōki departed for the Kumogakure battlefield, while Ōnoki posted a sun-marked bounty mission after learning Kitsuchi had lost Roshi, and Aizen accepted it for the Light Organization.