In the magic realm, magic is everything--everyone can use it, and one's skill determines their social status. Deep in the forest, oblivious to the ways of the world, lives Mash. Thanks to his daily training, he's become a fitness god. When Mash is discovered, he has no choice but to enroll in magic school, where he must beat the competition without revealing his secret--he can't use magic!

Innocent Zero's youngest child, Domina, steps in to put a stop to his father's pursuit of Mash. Using the reprieve afforded them, Mash's friends race against the clock in hopes of getting him to Meliadoul, the only hope he has of surviving without a heart. Meanwhile, as Mash hovers between life and death, he encounters a mysterious figure.