あのなつ。

Six former high school friends, now 27 years old, reunite at a class reunion, each harboring secrets and regrets from their youth. Tamaki, a legal secretary; Takumi, a businessman; Yuka, a single mother; Taichi, a shoe salesman; Shoji, an IT company president; and Moe, a teacher, find themselves thrust back into their 17-year-old selves after a night of drinking. They awaken to a mysterious time slip, back to the summer of their high school years, receiving emails that challenge the lies they've told or truths they've hidden. As they navigate this second chance, they must deal with unresolved feelings, the complexities of their past relationships, and the opportunity to rewrite their futures. (Unreviewed summary by Grok 2)