It's already been five years since his mother passed away and he has been living with his father. He lives with his father, doing the housework in between school. One day, when Naoki comes home, he finds a gorgeous home-cooked meal and a young woman... He's heard about it: Mika, his father's former secretary and former girlfriend. "Dad, I've decided to remarry Mika," the young beauty suddenly becomes his stepmother. It was inevitable that Naoki would start thinking of Mika as a woman.