As children, many of us dreamed of growing up sooner, but in fact, adult life hurts our heads. And, having had enough problems, we begin to look back with sadness on our school days, when we had no worries at all. Such was the situation that 25-year-old Hana Hatori found herself in. Striking out in search of any suitable job, she suddenly receives a very unusual offer from her relatives. She is asked to attend school instead of her lazy 16-year-old cousin! Without thinking twice, Hana agrees to the venture. However, pretending to be her sister is not difficult for her. Hana is very young-looking, and she and her cousin are like two peas in a pod. Therefore, Hana quickly joins the hectic school life. But then she gets a surprise. One of the teachers turns out to be her former classmate Akito Kanye! And he was not able to fool her, he quickly recognizes Hana as a cheater. She tries to pull off an elaborate scam, but Akito agrees to keep his mouth shut. But not for free, of course. In exchange for her silence, Hana has to attend Akito's extracurricular classes, and God only knows what they will do there. -