Heisuke has just arrived in town, and his first priority is chasing pretty girls, a pursuit that results in him getting punched. Upon reaching the house where he will be staying, he spots a girl attempting to sneak inside. Viewing this as a perfect opportunity to legitimately grope a girl, he tries to stop the intruder, only to discover that it is the same girl who punched him earlier. Not only that, but her name is Umi, and she happens to be one of the three sisters living in that house along with their mother. The next day, Umi learns that Heisuke is a boxer whose skill is only eclipsed by his lecherousness. Follow Heisuke as he tries to determine which desire is stronger: his desire for boxing or his desire for girls!