Amamiya Antique Shop is located in a corner of a port town. 24-year-old dealer, Yojin Amamiya, takes on the job of appraising antiques with his younger brother, Kaisei, who has mysterious powers. Soon after solving a case involving their parents with detective Masashi Motoki, who takes care of them, a certain change occurs in the Amamiya Antique Shop. Kaisei, who had always disliked people, began to actively engage with them. Yohito is happy to see his younger brother grow up, but the presence of a chest shakes the brothers' hearts...? A beautiful antique mystery that strikes a chord with the hearts of the brothers.