I Picked a Hammer to Save the World

Tiny is a headstrong, muscle-bound warrior who would rather smash his way through obstacles with his trusty warhammer than use his brain. When he is defeated by the Demon Beastlord Gluttony, he is sent back in time to his orphaned youth. Relying on his knowledge of the future, the young Tiny must right the wrongs of the past, gain new powers, and prevent the extinction of mankind.