Demon lord killed by a slime ?? When ? Maybe cause I havent read this in a long time I forgot ? But did that really happen ? I hope it was a OP mimic slime.
@grandartillery@Velsy First chapter, second thing the MC ran into is a slime that can instantly dissolve anything it comes in contact with. Most likely it ambushed and instantly ate the Black Demon Lord, which is not the same thing as a Demon King.
@HayashidaYuki Pulling this out of my ass, but going by the title of the book that was written in Japanese in the last chapter, the color Demon Lords (Black\Blue\etc.) are custom-made monstrous creatures created by a previously Isekai'd Japanese person as test subjects/super weapons.
@HDMI1 I remember now his encounter with the slime. Makes it even more epic if it killed high level people as a demonlord. The fact that he survived the encounter. Tale to be told huh