Yuu Innami is an Oni and an active member of the Oni Corporation. He is a part-time instructor at Rasetsu Academy. Innami is a sickly-looking man with dark purple hair and curtain bangs. He has heavy bags underneath his eyes and is often seeing bleeding from the mouth due to excessive coughing. On each forearm, Innami has a metal zip that allows him to release his blood. In spite of being physically exhausted and frail, Innami is incredibly optimistic. He is pragmatic and patient, trying to encourage his students and is happy to see them outmanoeuvre him in battle.