The Kuwahata family lost their mother early. The inside of the house is rough. Shinichi, the eldest son of twenty-four years old, virgin, and NEET. Shinji, the second son who has sex with her in his room. His father, Kotaro, decided to hire a live-in housekeeper because he couldn't see the dilapidated house. The one who came was Ayako, a beautiful woman in her twenties. The three surprised parents and children naturally struggle to make her a thing.