In a world where skill is absolute, Fate, a boy despised for his incompetence, is forced to live at the bottom of the pile. This is because Fate’s skill, “Gluttony,” is completely useless, as it only makes him hungry. The Vlerick family, one of the highest-ranking families of holy knights in the world, picked him up, and he was subjected to violence and forced to do chores every day. The only relief is Roxy Hart who treats Fate without looking down on him, even though she is a holy knight. However, his world changes forever when he and Roxy accidentally kill a bandit that has entered the castle. The moment he took the enemy’s life, his Gluttony skill was triggered and his opponent’s power flowed into him. Fate’s skill, “Gluttony,” is an extraordinary skill that allows him to take away the skills and abilities of the person he kills. Fate has gained the power to fight, then meets Greed, a sword with an ego that also bears the name of a deadly sin and steps further into the world of conflict. In order to protect his loved ones and fight against the unreasonable world, Fate devours the enemies that stand in his way. The destiny of the boy who once simply grovelled on the ground begins to change rapidly.