When the summer break began, Jinno Naoto and Manabe Rika confessed their thought they had since their childhood and began to go out with each other. Suddenly a boy named Asmo appeared. He said he was a devil, and he tried to take Rika away. Naoto did his best to save Rika from Asmo, but he couldn’t anything to do with devil’s power. At that very moment, a girl Laveriel, who name herself an angel, came and saved them.
They took Loveriel injured in the battle against the devil. There, Loveriel told them the surprising things; angles in Heaven and devils in Hell have been fighting for a long time, and the devil would attack them again.
Because Loverel had lost her power during the fight, she asked Rika fight for her.
On the other hand, the devil had lost his power in the fight. Then, Otonashi Meimi, who was a classmate of Naoto, happened to come and see Naoto confess his love to Rika, and she became jealous. Taking advantage of her jealous, he haunted her. He made Meimi into an evil heroine, Misty, and made her attack Rika again. On the other hand, Loveriel turned Rika into “St. Jibril” and let her fight against them.