According to an adult game by Front Wing.

Otonashi Meimi is walking alone in a empty park once the demon Rococo suddenly appears. Rococo uses her Eternal Arm attack on Meimi so that you can separate the strength of Misty Mei from the inside of her body.

Meanwhile, at Naoto's house, Hikari, Naoto's stepsister who was simply studying abroad, returns home. She starts coming to the same school as Naoto, and yes it worries Rika, Naoto's lover, somewhat.

"I like the particular most on the globe.Inch - With these words, Naoto makes love with Rika inside the school nurse's office. However, Misty Mei appears and spirits Rika away. Then, the angel Luvriel appears praoclaiming that Naoto does not have any choice but to have relations with Hikari to ensure a whole new Jibril might be born in order to save Rika.