金属スライムを倒しまくった俺が【黒鋼の王】と呼ばれるまで

줄거리

One day, a large hole opened up in the yard of a house. There was a mysterious slime with a metallic body that was trembling and shaking. For some reason, Yuma 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!

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