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Kana has been having an affair with Sakurai, a man with a wife and children, for 15 years. During her frustrating days, a sudden encounter with a man, Yoshimura, changed her life. A serious and kind person... Kana vowed to marry Yoshimura and decided to cut off her relationship with Sakurai. Kana meets Sakurai in person to say goodbye. After that day, the happiness of Kana and Yoshimura collapsed at once like a building block.