Kikuchi, who failed the entrance exam three times and has no other options, moves in next door to the Komori family, who are living a peaceful life. Ai and her husband decide to support Kikuchi, who is honest but clumsy. However, Kikuchi falls in love with Ai from the first time they exchange greetings, and one day, when Kikuchi invites her to dinner as a courtesy, he pushes her down. However, after that, Kikuchi not only abandons his studies due to guilt and regret, but also deteriorates physically. Ai leaves a letter, lies to her husband for the first time, and comes to stay at Kikuchi's house...