When Mineko takes in a mysterious, wounded teenage boy who literally falls upon her, she discovers that he is actually Helios, one of the rulers of the Realm of Magic, who came to the human world to find a saviour. Mineko then promises to help him find the savior, all while trying to hide him from her family and friends. However, Tooru and Kazura, Mineko's friends, eventually find out, and though Tooru disapproves, they let Helios stay with Mineko and keep it a secret between them.