After dying in a truck accident (classic isekai style), a cynical office worker is reborn not as a slime, a hero, or even a typical demon-but as the Demon Progenitor, the very first and the most ancient source of demonic power in existence. Now, trapped in the Tensei Shitara Slime Datta Ken universe long before Rimuru's rise, he must navigate his overwhelming abilities, chaotic demon subordinates, and the terrifying responsibility of being the origin of all demons.

OP Kiyotaka Ayanokouji Kiyotaka died and got reincarnated. How he die? Who knows. KiyoKei wasn't a thing since there was no point of them dating as Kiyo's gonna die in the Prologue. Warning to only Reincarnated as a slime fans: This story may not turn out how you like it. Pairings is Poly. So far I've (Overlord_End) decided on Kiyo, Shizue and Luminous (Yes, even though she's yuri).

After Y/N L/N had a heavenly fight with the Dragon Monarch and winning, Y/N with the powers of the rulers, had drank from the Cup Of Reincarnation to turn back the time many years ago to bring back all of the lost souls from the dungeons and his friends and allies. This decision did came at a cost as Y/N was unable to live in the peaceful world with his family and friends... With taking some time to decide... Y/N had decided to leave his world to go to another world that can contain his powers. This is the story of how The Shadow Monarch will raise in the ranks of power in this world and sit upon his throne at the top.