Kuniharu Kakizaki/Plot

Background
Kakizaki joined Border during its debut. He was formerly a part of Arashiyama Unit.

B-Rank Rank Battles Arc
When Yūma is lost in the halls of HQ, he guides him to the Rank Battle place. He reveals that his team is one of Mikumo Unit's upcoming opponents. When Kako asks for Yūma to join her unit, he shows visible surprise.