Arashiyama joined Border during its debut.[1]

Introduction ArcEdit

Jun's siblings

Jun's siblings

Jun was first seen when his unit was dispatched to rid of the Neighbor at Osamu Mikumo's school. However, the Neighbor had already been killed by Kuga, so Arashiyama Unit didn't get a chance to show their abilities. Jun thanked Mikumo because he saved his siblings, and told him that he would be on his side. After that, the Unit was called to withdraw.[2]

Black Trigger Capture ArcEdit

Border Enlistment ArcEdit

Large-Scale Invasion ArcEdit

B-Class Rank Battles ArcEdit