Crossover Anime: Building a Demon Familiar from Scratch

Travel through the world of High School DxD and obtain the Demon Gate.

Not only can it switch between humans and demons, but it also has unlimited contracted followers and the ability to traverse countless worlds.

In the world of Demon Slayer, Shinobu Kocho, you wouldn't want your sister to be unable to be resurrected, would you?

In the world of Akame ga Kill!, does Kurome want to be with your sister forever?

In the world of Date A Live, it seems that elves and demons can merge (?).

Sword Dance of the Spirit Master