Azusa (29), wanting a serious relationship after a heartbreak, is introduced by her best friend to someone unexpected—her first love from high school, Yusei (29). Caught up in the emotions of their reunion, they spend a night together. However, when they meet again, he’s no longer the same boy she remembers—he’s become intensely possessive. Between the sweetness of their past first love and his overwhelming attachment, the two must navigate their awkward relationship to discover what true love really means.