Arc 4The Sand Front
Shin'un led Konoha forces against the Sand Ninja, then took a squad to steal intelligence from an outpost. The mission succeeded, but Dan Katō died from his wounds before Shin'un returned to camp.
- Shin'un led nearly a thousand Konoha ninja into the Land of Rain, where he killed Sand Ninja and helped turn back their assault on Konoha's defensive line.
- Shin'un found Nawaki shaken after his teammates died, then learned that Orochimaru was bringing two thousand reinforcements while Tsunade headed to another front.
- Nara Shikahito assigned Shin'un five squads to steal intelligence from a Sand Ninja outpost, with Nawaki and Dan Katō among the team.
- Dan Katō used the Spirit Transformation Technique to scout the outpost, and Shin'un led an assault that broke through its barrier so Nawaki's squad could seize the intelligence.
- As the Konoha group escaped, Shin'un found Dan Katō gravely wounded, killed the Sunagakure jonin Hirakawa and two chunin attacking him, and ordered a ninja to carry Dan.
- Sand Ninja ambushed the retreating Konoha ninja, but Shin'un's Lightning Net delayed their pursuers long enough for the group to escape and hide.
- Dan Katō stopped breathing and died despite the group's efforts, so Shin'un ordered his body sealed in a scroll and led the survivors back to camp.
- Shin'un, Yūichi, and Shiina Kō reached Konoha's camp and went to report to Nara Shikahito.