Aihara is a straight-laced office worker who still harbors feelings for his first love from high school. To cope, he plays trumpet in a local concert band as a creative outlet. His quiet and orderly life is unexpectedly disrupted when a new member joins the ensemble: Hayama, the very classmate who first captured his heart years ago. Now an adult, Hayama has taken up an instrument specifically to reconnect with the time he and Aihara once shared. The two men are given a second chance to rekindle their friendship, but the lingering question of a sudden kiss between them in high school creates an immediate undercurrent of romantic tension. That tension boils over when a passionate encounter leads to Hayama pinning Aihara to the ground, forcing them both to confront the physical and emotional desires they have suppressed for years.

The story is set in contemporary Japan, balancing the mundane settings of Aihara’s office job and the more intimate, creative atmosphere of their concert band rehearsals. The narrative primarily focuses on Aihara as he struggles to move on from an unforgettable past, only to find that past standing right in front of him. Hayama is depicted as someone who outwardly tries not to rush things, but whose deep-seated attraction to Aihara is palpable. Their dynamic is fueled by a shared love of music and the sweetness of rediscovering a bond they thought was lost. The manga explores themes of miscommunication, lingering regret, and the realistic awkwardness of two people learning to be close again after a long separation. Despite the presence of mature, explicit content that highlights their physical chemistry, the overarching tone is described as sweet and charming, focusing on small gestures of care—such as Hayama learning an instrument to honor Aihara’s passion. The primary narrative arc follows their journey from an unresolved high school memory to a physically and emotionally fulfilling adult relationship. The manga is a complete story contained in a single volume, which also includes a short bonus story at the end about a lawyer and a pharmacist, unrelated to the main pair.