Arc 4The Oasis Fortress
Mukai won the Chunin Ninja Exams, then returned to the Land of Wind and built an oasis settlement, school, and fortress with his allies. As Akatsuki faced growing threats from Hanzō and Rain forces, Mukai’s hidden powers and technology helped expose infiltrators and protect Yahiko’s town.
- Mukai awakened the Spirit Transformation Technique in his sleep and absorbed the lingering memories of the dead, including three powerful spirits who stabilized him.
- Mukai defended Sasori after Sasori was disqualified from the Chunin Ninja Exams, then defeated Ibiki Morino and Uchiha Inabi to win the finals.
- Mukai returned to Sunagakure and persuaded Elder Chiyo to support his plans for a school, reclaimed land, and an oasis settlement, while Yakushi Nonō agreed to become principal.
- Mukai, Pakura, Sasori, Konan, Nagato, and Akatsuki members built smelting equipment, a kiln, and a fortress at the Oasis Workshop as Yahiko organized the settlement.
- Hanzō ordered an investigation of Mukai and Akatsuki, while Danzo warned him that Mukai and Shisō were working with the group.
- Mukai’s Fortress Core detected infiltrators, and Mukai and Sasori killed three White Zetsu before Mukai arranged for the fortress to monitor the camp and develop coordinated puppet tactics.
- Mukai gave Orochimaru the White Zetsu bodies for research and warned him against human experimentation, then discovered Rain Ninja near Moon Sake Town.
- When Saionji Moriuchi’s forces attacked Moon Sake Town, Sasori and Nagato protected the defenders while Mukai’s Zealot Mecha unleashed a shockwave that killed Moriuchi and left the surviving Rain Ninja to summon Ibuse.