Arc 2Lightning and War Missions
Shin'un refined Lightning Wall into Lightning Ring Wall, earned promotion after killing an Iwagakure Jonin, and led his squad through dangerous missions. The arc left him accompanying Hatake Sakumo’s team on a mission to extract Yakushi Nonō from Sunagakure, after they attacked a Sand Ninja outpost.
- Orochimaru tested Shin'un, Shiina Kō, and Uchiha Yūichi with C-rank ninjutsu, and Shin'un transformed Lightning Wall into the offensive and defensive Lightning Release: Lightning Ring Wall.
- Orochimaru made Shin'un captain, accepted Lightning Ring Wall for an S-rank mission credit and twenty million ryo, then took the squad to destroy a Stone Ninja stronghold.
- During the attack, Shin'un fought an Iwagakure Jonin and killed him, while Yūichi defeated a Chunin and Shiina Kō suffered a broken thighbone.
- Orochimaru treated Shiina Kō and sent the Konoha ninja back, while Tsunade later confirmed Shiina Kō was healing and Orochimaru promoted Shin'un to Chunin.
- Orochimaru assigned Shin'un’s squad an urgent extraction mission with Hatake Sakumo, who revealed that a Konoha spy in Sunagakure needed rescue before her identity was exposed.
- Shin'un recognized the spy as Yakushi Nonō, and Hatake Sakumo led the team toward their rendezvous point while they crossed the Land of Rain.
- When scouts found a Sand Ninja outpost blocking their route, Hatake Sakumo chose to attack, and Shin'un used his lightning techniques to kill two defenders.
- Hatake Sakumo ordered the Anbu to clear and dismantle the outpost, while Shin'un and his teammates moved into a tree and Yūichi asked him for advice on improving.