Nao and I are not really parent and child. Nao was the stepchild of her remarried partner. Several years after he remarried, his wife passed away and he raised Nao single-handedly. A few years later, Nao, who has become a member of society, said that he had someone he wanted to introduce, and brought his fiancée with him. At that moment, I realized that I was in love with Nao and was jealous of the two of them. Then, one night when they started living together, the married couple started to live together.