Myoudouin Satsuki

Myoudouin Satsuki (明堂院 さつき, Myōdōin Satsuki?) is Itsuki's older brother, who has a condition on which he can't walk properly. Originally the heir and a outstanding fighter, he influenced Itsuki a lot. He remains Itsuki's support throughout the whole series and eventually undergoes an operation to cure his condition.