The messenger Ed, who was living in the boarding house of the private Edwards Academy, a school for magic users and humans, met Delta, a lost messenger with amnesia. Delta was living a peaceful life with his new master, the witch prince Garret, who was helping Ed's brother Sid in his herbal store. After an incident at the academy, Delta and Ed moved into Sid's house, but one day, Delta disappeared. Furthermore, none of the others remember Delta. When Ed, alone, searches for Delta, his brother Lido, the last pure witch, appears and leads him to Delta. Delta has become trapped inside the Great Witch's illusion. Although he is unable to bring Delta back, he discovers that Delta is a mere survivor from 500 years ago, and the memories of Elle, a messenger he met 500 years ago, also return and she begins to tell him that Delta was once Elle's "mother of hearts." ......!?