Coming Heart

Our guy failed his university entrance exam and has to go to a prep school. Since the school housing has no more room, he has to live with a distant relative. When he got there, he found his relative, an older sister type he hasn't seen in 5 years, living with two of her friends because her parents are away. They welcomed him into the house and welcomed him in other ways later on. There, he enjoys his stay and school, until a room is found for him at the school housing. He has to leave, but which of 4 girls will he be together with?