You really don't remember me, do you? That question from Lewis, the blue-eyed British newcomer, is the last thing Tono Arata expects to hear at his small seaside IT firm. Arata has lived in this quiet rural port town his entire life, working a steady job and settled into a peaceful, predictable routine. His world is upended when Lewis walks through the door, a handsome and charming expatriate whose blunt manner and lack of Japanese corporate etiquette immediately clash with office norms. Lewis is openly affectionate, invades personal space, and leaves company parties early to watch anime, behavior that flusters the more reserved Arata. Yet Arata cannot ignore how Lewis's gaze follows him, nor the strange sense of familiarity he feels.

The truth of their connection lies in a shared past that Arata has forgotten. Years earlier, Lewis visited this same town on an anime pilgrimage, drawn by a bizarre series about an alien oyster. During that trip, he met a young Arata. At the time, Arata had long hair and delicate features, leading Lewis to believe he was a beautiful girl. They shared a single, magical day together, and Arata developed a crush on the foreign visitor he thought was a girl. For Lewis, it was a moment of true love. He studied Japanese obsessively and eventually returned to Japan, securing a job at Arata's company specifically to reunite with him. The central narrative arc follows Arata as he pieces together this mistaken identity, realizing that the girl he once crushed on and the man now sitting across from him are the same person.

As the story progresses, the focus shifts from the shock of revelation to the slow, awkward, and tender development of a real relationship. The two men navigate their growing closeness in the workplace, with small moments serving as milestones, such as Lewis mastering the art of opening convenience store onigiri or Arata becoming more willing to try new things outside his comfort zone. Lewis's aggressive Western habits, like kissing coworkers on the cheek, cause cultural friction, but also allow him to be refreshingly direct. In one notable scene, he publicly shouts Arata's praises to his father, a gesture that helps Arata feel seen and validated for leaving the family oyster farming business to work in IT. The story is compact, resolving in a single volume that spans from their reunion to the acknowledgment of their feelings and a final, explicit scene that marks the natural culmination of their romantic tension.