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Next to the Komori family, who are living a peaceful life, Kikuchi has moved in after three waves. Ai and her husband support Kikuchi, who seems sincere but clumsy. However, Kikuchi fell in love with Ai from the first time they exchanged greetings, and one day, when she was invited to dinner as a favor, she pushed Ai down. However, after that, Ai, who saw Kikuchi's body decline instead of abandoning his studies due to guilt and regret, left a letter, lied to her husband for the first time, and came to stay at Kikuchi's house.