Truck-kun, Knife-san and the Unkillable Hero

Sending people to their's dead and a new world! That's the job of the rookie Truck-kun and the senior elite Knife-san. In one particular job though, they finally meet their match. How will they deal with the former Hero that can't be killed and send to another world no matter what?Basically it's a Slice of Life, kinda-dark comedy story surrounding the transitiory part of the another world adventure.