Devastated, 37-year-old music teacher Manabu Hara attempts to move past Rihito Sajou, who is now distant and content with another person. As a result of his solitude during a night out, Hara impulsively kisses an attractive man wearing glasses, imagining Sajou in his place. To Hara's dismay, the man reveals himself to be Aoto Sorano—one of his new students. Even though Sorano promises to keep the incident secret, Hara rejects any advances, as he does not wish to enter a romantic relationship with someone underage. However, given his energetic and cheerful demeanor, Sorano might be exactly the person Hara needs to learn to love again.