It's been five years since my mother passed away and I became a fatherless family. Naoki did housework in his free time from school and lived next door to his father. One day, when Naoki came home, he found a sumptuous meal at home and a young woman. It was Mika, who used to be his father's secretary, who heard the story. “Dad, I have decided to remarry Mika.” A young beauty suddenly became a mother-in-law. … It was inevitable that Naoki would consider Mika a woman.