Demonic Rebirth D R

I was just relaxing after turning in the test, when I died! Some sort of godly being told me I would be reborn and the angel who got me killed would become my servant?! What is this?!

He has become a demon lord, the creature of evil that heroes grow stronger to beat. "Why me?!" Apparently, he doesn't even want this role and wishes to hide away safely...sadly, it doesn't appear that everyone else feels the same. He's a demon lord, after all...