Monster Eater

Alternative:

Mamono Kurai no Boukensha – Ore Dake Mamono wo Kuratte Tsuyoku Naru / 魔物喰らいの冒険者～俺だけ魔物を喰らって強くなる～

Rudd’s a nobody– just an E-Rank adventurer with a seemingly useless talent of status immunity. An outcast in a city obsessed with labyrinth crawling, he’s stuck scraping by as a “grubby forager,” navigating guild politics and backstabbing adventurers just to survive. But when a betrayal leaves him for dead without any supplies or help, he does the unthinkable and consumes the flesh of fallen monsters…