Suzuki Satoru as Momonga finds himself alone in a strange cavern after the end of YGGDRASIL, meeting and accompanying a slime by the name of Rimuru Tempest, he ventures out into the world to spread the name of Ainz Ooal Gown, not only in hopes of finding his guildmates, but also his creation Pandora's Actor. But how will an Overlord of a different world change the future?

(This is a repost from my Wattpad account KingChickenyNuggets) walpurgis ended but Clayman said something that slowly starts to reveal a plot older than time itself.

The already eventful lives of Ainz Ooal Gown and Rimuru Tempest was met with more trouble as a mysterious portal-like anomaly connected their two worlds together. What sort of chemistry and relationship would be culminated from such an event?

Peroroncino and bukubukuchagama were teleported to the great jura forest along with Mare and Aura.

No OC's in this story and, if required, Ainz stomping his way forward. Had to somehow actually kill Ainz to start this Crossover. So just go on with it. Overlord/オーバーロード and That time i got reincarnated as a slime/Tensei Shitara Slime Datta Ken crossover. No Rimuru.