I Killed So Many Slimes I Became Known As The Black Steel King

One day, a large hole suddenly appeared in the yard. There was a mysterious slime with a metallic body that was trembling and shaking. For some reason, Yuuma Mitaka, a dull high school student, spends his days exterminating the “metallic slime” that springs up in the hole every morning. As he repeats this daily routine, Yuma’s body undergoes an astonishing evolution!