Kankin Ou

Fumio Kijima is a timid student whose life takes a strange turn when a girl who calls herself a demon appears before him. Introducing herself as a campaign girl from the demon world, she grants him the ability to "summon a room" out of thin air. At first, Fumio does not abuse this power, instead using it as a convenient tool in his everyday life. But everything changes one day when his classmates torment him under a false pretext, leaving him to suffer. Where he once would have wallowed in misery and cried himself to sleep, he now has a power to call upon. "I will make them regret it!" With his ability to summon his "room," Fumio begins his era of confinement and brainwashing, determined to achieve his goals.