In line with the game by Front Wing.

If the summer break began, Jinno Naoto and Manabe Rika confessed their thought that they since their childhood and started to day the other. Suddenly a boy named Asmodeus appeared. He explained he was a devil, and that he experimented with take Rika away. Naoto did his better to save Rika from Asmodeus, but he couldn't anything regarding devil's power. As well time, a girl Luvriel, who name herself an angel, came and saved them.

They took Luvriel injured in the battle up against the devil. There, Luvriel said excitedly the surprising things angles in Heaven and devils in Hell have been fighting for some time, and the devil would attack them again.

Because Luvriel had lost her power throughout the fight, she asked Rika fight on her. On the other hand, the devil had lost his power within the fight. Then, Otonashi Meimi, who had been a classmate of Naoto, happened to come and see Naoto confess the romance to Rika, and she or he became jealous. Using her jealous, he haunted her. He earned Meimi into an evil heroine, Misty, generating her attack Rika again. Conversely, Luvriel turned Rika into Sei Tenshi Djibril and let her fight against them.