Yusuke is an ordinary high school student except that he mistakenly entered a boys high school. There is no sweet love romance at school.... His one and only hope is... to work at a seaside restaurant during summer holiday and meet girls in swimsuit there. But on the first day of summer holiday, he is hit by a bicycle and twists his ankle.... Yusuke has two sisters and they take good care of him. He needs to stay at home but his parents leave him and go traveling... and he starts to live with sisters for a while....
The main character used to live with parents and three older sisters happily. But their parents passed away in a car accident and each children were accepted by step parents. More than ten years later, here comes a lawyer and tells him that he has a grandfather and his sisters whereabouts. He goes out to meet his sisters soon but he is disappointed to see them to be changed dramatically. He and three sisters gather up at grandfathers house to allot his inheritance. The will says that people who can receive a fortune by inheritance are only one sister and one brother and one sister is decided by a brother! One month is given to him to decide after living with three sisters. Who will receive an inheritance and what will happen to them at the end.
Yuu Shirakawa moves in to his stepfathers house and starts to live with three step-sisters. One day he finds a magic bottle and falls victim to a terrible curse. The only way to break the curse is to fill the bottle with love juice. Living together with beautiful girls while trying to break the curse starts an erotic turn of events in his life.
