【No escape in the Demon King's Castle——Turn to the offensive and subvert adversity!!】 In a chaotic world where humans and demons fight each other, a human named Ren becomes a prisoner of the demons. His life has been nothing but running away until now, but he is forced to realize that he cannot survive in the demon territory without resisting... Just before his execution, he uses his wit to win over the demons, like a cornered rat biting a cat!? And for some reason, he starts to find his own place in the Demon King's Castle——The start of a turnaround Fantasy Comedy where his true potential shines after being cornered!