Since he was little, Ethan was often bothered by many ghosts, Arcana was his guardian. When he was a teenager, Ethan began to be able to fight these creatures himself but still had to be helped by Arcana. one day they were relaxing in an abandoned building. Ethan already considers Arcana as his own older sister who is the only one who can give him family warmth, and now he wants to spend his time with Arcana. "Arcana! You know I was disturbed by a ghost at school."