At the end of the year, I returned to my parents' house, Niigata. There they met their cousin Tsubasa-nee for the first time in 10 years. The sweet and sour memories of those days are brought back to life as we meet again for the first time in a long time. After all, she is my first love and my first kiss. "Hajime-chan...I've become a married woman." But she has a husband... And I have a wife... Even if they are first in love, they are married. There must never be a mistake. I never thought I'd spend three days going home with her and spending one night under the same roof...