45-year-old Hiro Kamon works as a librarian because she loves books. Although she is worshiped as the "aloof beauty" and "ideal female" for her beautiful, gentle smile and amiability, she actually dislikes people. Hiro has been hurt countless times, and Chōji, the only guy she loved wholeheartedly in university, also fled in one night. She has become a person who no longer believes in love and has decided to live alone for life. But she ends up acting as a "fake married couple" with Chōji, whom she happens to meet again, for the sake of his mother, Teruno, who has been given a short time to live.

故事背景设定在由大型企业出资设立的私立诚进学园。在这个推崇数字化管理、师生评价透明化的“令和教育现场”，52岁的鬼塚英吉将出任班主任。面对只关注社交平台信息、缺乏真实交流的学生，以及被考评制度束缚的教师群体，这位曾因特立独行而多次被开除的传奇教师，将再次用他那赤诚且充满冲击力的言行，直击当代教育的病灶。