Here is a story about two supernatural principals meeting and tour the unique schools. Making new friends along the way.

Some of the Espada got a second chance in life but now they got dragged to being the grandchildren of a demon and they have a brother.

The Doomslayer after he shut down the portal in Hell, he was betrayed by Samuel Hayden and unknown to him sent the Slayer into a world where Iruma thought he was the only human there, until now...

Suzuki Iruma works as a janitor at the UAC facility on Phobos.

Iruma magically ends up in Goha city.

One-Shot. Naruto never thought he'd be adopted, let alone by an old man that wants to be his grandfather, but now he also has a brother as well, there's just one thing, the old man is a powerful demon and due to the travel Naruto became a hanyou, but what really bothers Naruto is the fact he has to go to school with his adopted brother, never mind it being for demons. Adoption.

After getting used to his life in the Demon World, one spell (or two, or a catastrophe) gone wrong leads Iruma to return to the Human World, but does that kid have engine legs? These clearly aren't the humans Iruma is used to, and he is one! Will Iruma ever have a normal life? Probably not, so Welcome to Hero School Iruma-Kun!