Inose Hinata is a thirty-five-year-old woman who runs a small English conversation school out of her apartment, resigned to a life of singledom after a string of disappointing dates. One evening, a knock at her door reveals Shotaro, a former student she hasn’t seen in eight years. The shy ten-year-old who once had a puppy-dog crush on her has grown into an eighteen-year-old high school senior with a tall, muscular frame and unwavering confidence. He wastes no time in declaring his love and asking for her hand in marriage.

Shotaro first attended Hinata’s English classes at age ten and fell for her immediately. Whenever he proposed as a child, she brushed him off with “Maybe when you’re eighteen.” He took her words as a promise, and on his eighteenth birthday, he appears in his school uniform to hold her to it. Hinata is caught off guard: she finds him irresistibly attractive, but the seventeen-year age gap and his status as her former student give her serious pause. She tries to let him down gently, insisting that he should find someone his own age, but Shotaro is relentlessly persistent, refusing to take no for an answer and slowly wearing down her defenses.

The story explores the tension between Hinata’s rational objections and her growing emotional and physical attraction to Shotaro. She struggles with low self-esteem, believing herself to be boring or undesirable, which has made her accept poor treatment from previous partners. Shotaro’s sincere devotion forces her to confront her own insecurities. Meanwhile, Shotaro deals with his own vulnerabilities: he has Osgood‑Schlatter disease, a painful growth condition that has kept him from playing sports, and he experiences an awkward and disturbing encounter with a female classmate who exposes herself to him without his consent. That event leads to a serious conversation with Hinata about male consent and the pressure boys face to always be grateful for sexual attention, a moment that deepens their emotional bond.

As the series progresses, the will‑they‑won’t‑they dynamic plays out through a mix of comedic misunderstandings, steamy close calls, and sincere emotional exchanges. Hinata’s past bad relationships resurface, and Shotaro’s classmates begin to take notice of his fixation on an older woman. The narrative balances lighthearted romance with thoughtful examinations of age‑gap relationships, the meaning of love versus infatuation, and the courage it takes to open oneself to a connection that society may judge. By the end of the first volume, the physical tension finally breaks into a passionate embrace, but the central question remains: can Hinata overcome her own fears and societal pressure to give this improbable romance a real chance?