Yuki Kawachi (河内 勇樹 Kawachi Yūki): A member of Ryusei School. He suddenly attacked Arai and killed Asami because of the obsession with the Delta belt. But it was proven wrong since he called Kusaka to rescue him from the Frog Orphnoch. Still, it was too late. Before dying, he said that Sawada had the belt, but it was false. Yuki Kawachi is portrayed by Kenta Hinokio (檜尾 健太 Hinokio Kenta).