I! the Vampire Count Was Defeated

A terrifying castle that a team of adventurers conquered. When you push the door to enter, the Death Star is already shining in the sky. Lying in the coffin of despair is the overlord of another world. Perhaps the most merciful thing bestowed upon them is a silent death. "I once lived with monsters in a world where there was only killing." "Now, I brought the monsters to your world." "Maybe I'm just one of the monsters." This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.