Next to the Komori family, who are living a peaceful life, Kikuchi has moved in after three waves. Ai who decided to support Kikuchi, who seems sincere but clumsy, with her husband. However, Kikuchi fell in love with her from the first time she greeted him, and one day, when she was invited to dinner in her favor, he pushed her love down. However, after that, her guilt and regret saw Kikuchi not only abandoning her studies but also her body declining. Her love left a letter, telling her husband her first lie, came to stay at Kikuchi's house...
