Ever since I was a child, I've admired my aunt, and when I found out she worked as a private tutor, I decided to take lessons from her. Shiori, employed by a major tutoring agency, is approached one day during her third year on the job—her nephew needs help preparing for an exam. Answering the call, she agrees to step in temporarily. But upon seeing her grown nephew, long-forgotten feminine instincts stir within her, awakening new emotions. Hami, who met her nephew only once in her youth, begins tutoring him, yet their relationship quickly transcends mere education, evolving into the beginning of something far more intimate.