|It all started when summer break began. Naoto Jinno (Jinno Naoto) and Rika Manabe (Manabe Rika) confessed their love they had for each other since their childhood and began dating. Suddenly a boy named Asmo appeared. He declared he was a devil and attempted to kidnap Rika. Naoto did his best to save Rika, but he couldn’t defend against the devil’s power. At that very moment, a girl named Luvriel, who said she was an angel, came and saved them. Luvriel was injured in the battle against the devil and was brought to safety. Luvriel then told them the facts behind the incident; the angels in Heaven and the devils in Hell have been fighting for a long time. She also informs them that the devil would return for another attack. Because Luvriel had lost her power during the fight, she requested Rika to fight as a replacement. The devil had also lost his power in the fight. He then met up with Meimi Otonashi (Otonashi Meimi), a classmate of Naoto's, happened to come and see Naoto confess his love to Rika. This made Meimi jealous of Rika. Taking advantage of her jealousy, Asmodeus haunted her. He turned Meimi into an evil heroine, Misty May, and made her attack Rika again. Meanwhile, Luvriel turned Rika into "St. Jibril" (Jiburiru) and let her fight against the forces of evil, eventually destroying Asmodeus.
After the first series ends, the story continues. New characters including Hikari Jinno (Jinno Hikari), Naoto's little sister and Rococo, Asmo's sister appear in the new series. Within the series, Rika gets kidnapped by Misty May by using her monster to attack Rika. After the kidnapping, Naoto becomes upset that Rika was taken away. Similar to Rika's fate in the first series, Luvriel gets Hikari to become a Devil Angel. However, for this to occur, Naoto must make love with his sister. Initially, Naoto is shocked and refuses to commit such an act, but soon changes his mind when Hikari offers herself in order to save Rika. As they have sex, Hikari transforms into Jibiriru Aries and fights the forces of evil... including Dark Jibril, the converted form of Rika Manabe!
This peace is short-lived, with a strange new photography student taking pornographic pictures of some of the students, something connected to the return of Misty May. When a more powerful monster than they've ever faced before attacks them, Hikari Jinno is abducted, and the New Angelic Gaia Interface is activated, in the form of a blue-haired virtual girl named Nagi... Can the N.A.G.I rescue Hikari... or is it too late already?