After being wrongfully recruited by an extradimensional organisation that monitors isekai activity across the multiverse, Ken is forced to fake it as a RETURNER, one of the agents tasked with returning isekai victims to their original timelines. The catch is, if he blows his cover, he can never go home.

With all of time and space, and their infinite iterations across every dimension, at their disposal, the RETURNERS are made up of the past's, present's, and future's greatest heroes... and now Ken. A guy that was working at a Temp Agency until a couple of hours ago. He has several jobs to get back to, as many workplace crushes to pine for, and a secret he would rather die before having revealed: his parents named him after a video game character!

Can he live up to his namesake – THE DAEMAHKEN – become a hero, and someday find his way back home? Or, will everyone be stuck getting audited till the eventual heat-death of the universe?