A demon king has appeared in a neighboring kingdom and the king has to figure out how to deal with it. Meanwhile, Saitou makes a mistake which sets off a trap that sends him to one of the lower levels of the dungeon.

Kisurugi and his demon allies swoop down on Saitou and the others once again! Kisurugi has been assassinating the strongest adventurers in order to obtain the hidden treasure of a mage who can control time, but his reasons aren’t what anyone expects.