Tsuki no Ookami Otoko

Keiji and Keiichi are twin brothers who both train in martial arts, yet they appear mild-mannered and unobtrusive. Keiji has long harbored affection for his older brother Keiichi, but such feelings have never been returned. When Keiji starts a one-sided relationship with a classmate, his emotions become increasingly complicated. At the same time, Keiichi also begins a relationship with someone else, changing the relationship between the two brothers.