Itou Makoto♂

Makoto is the unlucky protagonist of School Days, Summer Days and Shiny Days. (Appears as the main hero in Cross Days.) A generally mannered and composed student in year one of class three, his life becomes complicated when he begins to unfaithfully initiate polyamorous relationships with girls that he is unable or unwilling to singly commit to. Although he is originally casual, gregarious and understanding, after becoming a sex addict, it completely corrupts his personality and he instead became apathetic, rash, and egotistical towards others, regardless of the harm or later consequences. However, once he realizes what he has done wrong, he is quick in his attempts to fix the situation. Makoto lives with his divorced mother and has a younger sister named Itaru who lives with their father. He is childhood friends with Katou Otome and best friends with Sawanaga Taisuke.

[From Wikipedia]