Rampage

S1, E4: The 7th Squad heads to the Defense Demon Force HQ for joint training with the 10th Squad. Summoned by the Supreme Commander Ren Yamashiro, Kyouka and Yuuki go to meet her alone. Her purpose is to borrow Yuuki. The moment Ren touches the chain, Yuuki responds to her overwhelming power and transforms into a new form, Killer Fang, taking on a grotesque, ominous appearance.