|“||...In Border, among all units, his is also the best. Representing Border, they also make TV appearances. They're famous people in Mikado City.||”|
|Ai Kitora||Mitsuru Tokieda||Ken Satori|
EmblemEditArashiyama Unit's emblem is formed by five black pentagons forming a white star symbol, with a smaller star symbol inside each pentagon.
Arashiyama Unit were the ones to respond the neighbour attack at Osamu's school. Kitora later attempted to take down an Ilgar that attacked the city.
Arashiyama Unit worked with Jin to prevent Kido's faction from taking Yūma's Black Trigger by force.
New C-class trainees were orientated and managed by Arashiyama Unit.
Arashiyama Unit were the first to kill a Rabbit, with Yūma's help. Kitora accompanied Osamu to the Southwest district in order to protect the C-class members. The Unit received an Outstanding Service Award, worth 800,000 yen and 800 points, for defeating Trion Soldiers in the emergence area and supporting Konami in the Southwest district.
Osamu expressed interest to Arashiyama Unit in learning how to fight on his own, rather than relying on Yūma all the time. Although Arashiyama didn't see the need for gunners and shooters to be able to take points on their own, he and Tokieda agreed to teach Osamu the basics. Later, while watching Osamu's humiliating defeat, they express concern over his self-esteem following it. Later, Osamu visits them for more training. Since Arashiyama was away, Kitora teaches him, but with some refusal because of Osamu's apparent arrogance. She teaches him about how to use Spider.