A mythical story with swords and magic centering around one lethargic Roland Empire student named Ryner Lute. After getting dragged into a war and losing many of his friends, Ryner is asked by the soon-to-be enthroned king, Zion Astal, to help rebuild Roland postwar by searching for legendary relics. Accompanying him is a beautiful, capable, yet arrogant swordswoman named Ferris Eris, who’s always quick to insult and abuse Ryner. Meanwhile, a new turmoil begins to approach Roland.

Taito has been really sleepy lately, and keeps dreaming of a female vampire who says she has given him her "poison." Sometimes he even thinks he hears her voice when he's awake. But after surviving an accident that should have killed him, Taito's world changes drastically and he realizes that his dreams are more real than he thought.

Now, let's kill the girl and save the world! The world has been shattered. As a result of the most dreadful of diseases that afflicts only girls—the "Labyrinth Disease." That's why the students are taking lessons. Lessons for the purpose of killing the girl. Learning magic, obtaining the map of the labyrinth, forming teams, and studying the weakness of the girl… The time limit is 6 hours. If the girl isn't killed within that time, then the world gets destroyed. "I have no interest in the world at all so please spare me. Frankly, it's really suffocating." Together with the one who said these words, the most horrible protagonist in history, enter the world of whizzing magic and surging youth. A school fantasy in labyrinth raiding, begins here!

The tyrannical rule, foolish king and greedy nobles cause the powerless citizens nothing but misfortune. In this ruined land, Sion Astal, the son of King Roland and an ordinary woman is faced with the difficult destiny of rescuing the country…and his friend! Based on Sion Astal's points of view, this tells the story during Ryner's exile and how Sion fight against the King of Roland to gain the throne.