There's a Dragon in the Haunted House

In the far north, there is an island.

On the island stands a building.

Inside the building is a dragon.

The outside looks dark and terrifying, but the inside is… even more terrifying.

It holds vicious beasts guilty of every imaginable evil. Let even one of them escape, and the world will be laid to waste.

There is only one jailer here. He barely does anything, yet no one dares cause trouble or try to escape.

That is, until a human wanders in…