Wataru is asked to replace his elderly grandmother as the new caretaker of a girl's dorm. Arriving at the dorm, he's greeted by two well-endowed bosoms... and one still cute petite pair. Being an introvert, the sight proved to be much too stimulating for the young man. After the breathtaking view, Wataru diligently completes his tasks as the caretaker and retires for the night... that is until he is approached by one of the girls who asks: "wanna have sex with me?" Just what does the future have in store for this young man and the dorm?