As summer break begins, Naoto and Rika finally confess their childhood feelings and start dating. Their new happiness is interrupted when the devil Asmodeus appears and attempts to take Rika away, leaving Naoto powerless against his strength. An angel named Luvriel arrives to save them, but is wounded in the battle and explains the ancient conflict between angels and devils. With her powers depleted, Luvriel transforms Rika into the heavenly warrior Djibril to defend against future attacks, while a jealous classmate named Meimi is swayed by the devil and becomes the dark heroine Misty.