Kisaragi Sumi is a 20-year-old university student. But do not be surprised that she is a 65-year-old inside. Under pressure to help out with the family business from a young age, she could not have a youth. Even afterwards, she devoted her entire life to taking care of first her grandmother and then her father and mother. Sumi finds herself turning 65 without ever having had a boyfriend. She takes a little pride in having lived with integrity. But after her mother passes away, she has the sudden thought of regaining her youth once more and making a fresh start in life. A miracle happens to her. One day when Sumi wakes up, she has the appearance of a 20-year-old. Despite being bewildered by this unbelievable reality, she introduces herself as Sumire and gets another try at youth.

65岁的如月澄（松坂庆子饰）在唯一的亲人母亲去世后，希望重新度过自己的人生，突然从家中屏风飞出的猫妖黎（及川光博饰）满足了她的愿望，将她的外表变为20岁时模样。澄改名如月堇（桐谷美玲饰）以全新的名字重新塑造自己的人生，体验年轻时时憧憬的大学生活，并与同一个研究室的好青年真白勇征（町田启太饰）相恋

この秘密は誰にも言えない… 桐谷美玲、65歳。 異色のヒロイン登場！ 前代未聞の45歳若返りラブストーリー!! 物語は“彼氏いない歴65年”の澄がたった一人の身内である母を亡くし、人生をやり直したいと願うところからスタート。彼女は突然、家の屏風から飛び出して人の姿になった化け猫・黎の謎めいた力によって、20歳の姿へと生まれ変わります。行きたくても行けなかった憧れの大学での生活、同じゼミの好青年・真白勇征との恋模様――。如月すみれという新たな名とともに、彼女は青春をやり直していくのですが…。

남자친구 없이 평생을 살아온 65세 주인공이 누구에게도 말할 수 없는 비밀을 안고 살면서도, 첫사랑에, 청춘에, 인생을 다시 살아보기위해 도전하는 판타지 러브 스토리를 그린 드라마