月宿る [Tsuki Yadoru]

異母兄弟の直弥と圭嗣。家庭の事情も相まって、兄の直弥に素直になれない圭嗣だったが、ある満月の夜、兄は部屋へと忍んできて…。 Dramatic series about Keiji Mogami and his half-brother Naoya Amamiya who is suddenly adopted into Keiji's family which highly prizes martial arts prowess. Naoya is several years older, and therefore better at swordcraft than Keiji, but Keiji's mother pushes him to work hard in order to beat Naoya. Naoya himself seems nice at first, but then he begins to show Keiji a much, much darker side.