A Japan where other worlds filled with monsters - dubbed as dungeons - are simply a normal part of everyday life. Public servants known as the "Capture Division" are in charge of dealing with them! Yuunagi Yuuma, a newbie eliminator who longs to be a hero, pairs up with his dispassionate (yet surprisingly caring) senpai Yonaga- and heads out to his 9-to-5 job subjugating other worlds!