姉妹輪舞

Main character's mother dies early and father gets in a fatal incident lately. Protagonist graduates from school with the leftover money, but he can't afford university or even dormitory. Father also had adopted daughters of his colleague who died in a joint travel trip. So now adopted daughters who inherited most of father's funds invite protagonist to live together as they want to pay back the time, care and love they got.

[From vndbreview]