Yuuri Shibuya, an ordinary high school student, finds himself whisked away to a medieval European-like world after a peculiar incident involving bullies and a toilet. There, he learns that he is destined to become the next Demon King due to his unique appearance. Unlike the typical ruthless rulers, Yuuri possesses a kind heart and a strong sense of justice. As he navigates the delicate balance between humans and the Demon tribe, he must grapple with the challenges of ruling a nation on the brink of war. Can Yuuri prove himself as a benevolent leader while bridging the gap between two conflicting civilizations?