At 25, earnest office worker Hana Natori agrees to attend high school in place of her cousin who refuses to go. Disguised as a student, she struggles with the youthful atmosphere until her cover is blown on day one by Kanie — her high school classmate who is now the world history teacher. Instead of exposing her, Kanie pulls her into a passionate kiss and an even more intense encounter, binding her in a secret that grows more complicated with every passing day.

As Hana navigates school life, jealous classmate Aida, study sessions, sleepovers, and emotional confessions, the relationship between the 25-year-old “student” and her teacher deepens. From risky public teasing and after-school “lessons” to heartfelt moments and jealousy-fueled clashes, the story builds toward an emotional climax where long-held feelings are finally revealed. The series mixes awkward adult-in-teen-world comedy with raw, passionate hentai scenes, exploring themes of age, desire, and genuine connection. A popular erotic romance adapted from the original work by Makana-sensei, featuring voice talents like Harada Hitomi as Hana and Sawashiro Chiharu as Kanie. Perfect for fans of teacher-student forbidden romance with plenty of uncensored heat.