(No System, no invincibility, no brainless protagonist, not a wish-fulfillment story. Plot-driven, with a slower pace.)
Demons truly exist in this world.
Among them are the even more powerful Seventy-Two Demon Gods.
Above the Demon Gods are the Demon Kings who rule Hell.
But in this world, suddenly overrun by demons, a group of people appeared.
They made soul contracts with the Demon Gods,
trading their lives for the power to kill demons.
They walked the world alone,
slaying demons and Demon Gods without end,
then dying alone.
Only after he appeared
did people see the beautiful, holy angels of legend.
But no one knew
that the Demon King of Hell was a fallen angel.
