Fate Barbatos has never tasted real power. Born with the magical skill Gluttony, he constantly hungers in a way that can't be satiated, and has been shunned and looked down upon his entire life. One day, while working as a gatekeeper for a noble family and fighting a trespassing thief, he discovers Gluttony's true power: when he kills someone, he devours their skills and feeds his gnawing hunger at last. In that grisly realization, Fate is awakened to his true potential. How many lives will he feed on to satisfy this hunger, and is the world ready for the frightening warrior he'll become?