The protagonist, Satomi, who happened to be present at the place where a fleeting beautiful girl, Rena, is crammed in the city. Sumi, who decides to hide Rena who has run away from the marriage to escape from the marriage, is gradually attracted to her who will do her best for herself. However, one day, Rena suddenly puts her lips on his lips, as she behaves as usual with a feeling that can never be told. Under one roof with a beautiful deep-window daughter presented by Minoyama-sensei, a royal road pure love sex kid.