New challenge:

It is always said that a simple gesture could change the world and this also applies to the anime. Indeed, how would the story change if Shiro did not slap Rin that night and so was never possessed by Satan? Or if Rin had listened to Shiro that night and left without discussion?

The story should contain the following facts:

- Shiro is alive and trains Rin personally

- Rin can go out with anyone, but I have a preference for Mephisto / Rin

- Rin does not go to the exorcist school, but becomes friends with Shiemi, Bon, Konekomaru, Shima, Izumo and Shura.