The first time I went out to the cottage to rob, I failed, but I met an old man and risked my life in order to save him.
As a result... He brought him to some hellish place, and the people here looked like the monsters dad said.
In short, the soul of an ancient MM has traveled to the Net King and has the power of death.
If nothing unexpected happens, the male protagonist is the gentle and delicate Fujidon.