Yuri Shibuya's life was uneventful until he embarked on a daring rescue mission to save a classmate from bullies and found himself plunging headfirst into a toilet. This bizarre incident transported him to a world that shared similarities with medieval Europe. To his surprise, Yuri discovered that due to his hair and eye color, he was the chosen one who would become the next Maoh. The Maoh people were a group of Mazoku who lived in disharmony with humans, and they desperately needed a new king. Yuri's kind, fair, and non-violent personality was a stark contrast to the previous rulers' harsh leadership style, causing his subjects to question his abilities. Now, Yuri must learn how to be a great Maoh while navigating the complex customs and challenging relationships between the Mazoku and humans. Tensions are high, and the situation is deteriorating rapidly, leaving Yuri with the responsibility to save his world from destruction.