Thanks to his housekeeper-turned-boyfriend, Kou, Natsume has moved past his initial plan of using a hired escort to get back at an ex. Having discovered genuine intimacy, he now wants to become a lover worthy of Kou. He sets out to improve himself, but his plans are disrupted when Kurumi, Kou's childhood friend, returns to Japan. Kurumi's arrival threatens the stability of Natsume and Kou's budding relationship, forcing Natsume to confront his insecurities and the strength of the bond he has built. Set in contemporary Japan, the story follows Natsume, a man prone to overthinking, and Kou, his patient and caring partner, as they navigate the challenges posed by an old friend re-entering Kou's life. The narrative arc focuses on Natsume's growth from a resentful, insecure person into someone capable of believing in a loving, committed relationship, and the couple's struggle to protect their happiness against an external disruption.