One day when a summoning goes awry, Cless Alvein has a literal Demon King brought to his room, and from there hilarity turns into something else dire when he as well as his friends become caught up in it.

It is a story, of another world, where someone who can do nothing but watch, can now do something more than watch. However, in the end, even if they are able to do something... will they regret being brought into this world anew? Dhaos/Cless, Arche/Chester, ensemble