Kankin Ou

Fumio Kijima is a timid student whose unremarkable life changes forever when a girl claiming to be a demon suddenly appears before him. Introducing herself as a campaign representative from the demon world, she grants him an extraordinary ability: the power to summon a room out of thin air. Initially, Fumio exercises restraint, refusing to exploit this supernatural gift and instead using it merely as a convenient tool to ease his daily routine. However, his peaceful existence shatters when his classmates turn against him, subjecting him to severe bullying under entirely false pretenses. In the past, such torment would have left him wallowing in misery, crying himself to sleep without any means of resistance. Now, armed with a unique power, his mindset shifts drastically. Vowing to make his tormentors regret their cruelty, Fumio abandons his passive nature. Embracing the dark potential of his summoned space, he initiates a calculated campaign of confinement and psychological manipulation. No longer the helpless victim, he uses his isolated room to systematically brainwash those who wronged him, marking the beginning of a ruthless new era dedicated to achieving his ultimate goals.