The world Star King Dragon Veldanava created was supposed to get a small unassuming slime with great potential. However, fate seems to be whimsical sometimes and gave the unprepared world a vast dungeon full of beings, both wondrous and terrible. Nazarick, knowingly or not, is bound to reshape the very foundations of the world.

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?

With the end of DMMO-RPG Yggdrasil approaching, Momonga decided to spend the last moments of the game reminiscing with one of his guildmates, a player with a slime as their race; Rimuru Tempest. After the shutdown, however, both of them instead find themselves within a completely new world as both they and Nazarick had been transferred to it.

If one were to look at the dreadful Overlord and the cute slime, they would think that there were no similarities between them. But behind their drastically different appearances was a strong bond between the two, who had found solace in each others' pasts. And everyone soon realized that whoever got in the way of their grand ambitions, there was only allegiance, or death.

(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.