Koichi, a ronin who lives alone in the same apartment, attends a cram school while working part-time. Kanae, who lives next door to him, looks like Koichi, who is doing his best, somewhat resembles his younger brother, and he began to take care of him. However, one day, Koichi, who was desperate after failing a mock exam, pushed Kanae down. Still, Kanae, who knew Koichi's true kindness, decided to become a one-night lover in order to get Koichi to like him again. Lying to her husband for the first time in her life.
