Boushoku no Berserk

Fate Graphite lives at the bottom of society because the skill he was born with, Gluttony, appears useless and leaves him with nothing but endless hunger. He works as a gatekeeper for holy knights who exploit and despise him until he kills a thief while trying to protect the city.

Fate then discovers that Gluttony does not consume food, but the abilities of those he defeats. His strength begins rising at a frightening pace, and a mysterious sword helps him understand the nature of his power while warning him that the hunger will not remain satisfied for long. Working beside the kind knight Roxy Hart, Fate tries to use this new strength to protect the few people who treated him as human, while facing a harder question: can he control an appetite that grows with every victory?