Arifureta Shokugyou De Sekai Saikyou Episode 1 (Must Try)

Driven by a primal urge to survive, Hajime kills a monster and—driven by starvation—eats its meat. The monster flesh is poisonous to humans, causing his body to break down and regenerate repeatedly. This agonizing process, fueled by a rare "God’s Crystal" dripping healing Ambrosia, forces a mutation:

Hajime survives the fall but loses his left arm to a monstrous Twin-Headed Wolf. Broken and bleeding, he hides in a small crevice, walled off by his transmutation. The physical pain is eclipsed by a psychological snap; the "kind" Hajime dies in that hole. He realizes that in this world, "efficiency" is the only morality and "strength" is the only law. The Transformation Arifureta Shokugyou de Sekai Saikyou Episode 1

He absorbs the monster’s magic and skills, skyrocketing his power levels. Driven by a primal urge to survive, Hajime