Until I was called "King of Black Steel" (1) / Izuko Fujiya

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

Yushin Mitaka, a high school student who lives an ordinary youth in idleness, discovers a mysterious hole in the garden of his house one day. There was a "guy" who trembled with a metallic body. It is only a matter of time before a boy who continues to kill metallic slime from that day will shock the world. It is an unprecedented fantasy that gets the strongest power without awareness!