Chained Soldier, Vol. 8 (manga)

Having been lent to Supreme Commander Yamashiro, Yuuki goes berserk in an overwhelmingly powerful new form—one too strong for his body to handle. Meanwhile, the Azuma Family is preparing to decide their next leader. Desperate to prove herself to both her mother and her relatives, Himari resolves to participate, plunging her and Yuuki into a vicious free-for-all battle with their pride on the line!