Akuma-kun

A young boy named Shingo Yamada is marked with a birthmark that identifies him as a chosen warrior against demons. Dr. Faust, foreseeing a demonic uprising but too weak to fight it himself, entrusts Shingo with the task of defeating this threat. To aid him, Faust summons Mephisto, a reluctant demon who signs a blood pact with Shingo. Together, they prepare to confront the supernatural forces emerging to dominate the world.