クロガネ
"Guild master of the Kamata Crafters, based in Ota Ward, which is unique among the 23 wards as having gathered skilled craftsman and artisans from each of the worlds interacting with Tokyo. During the day, he attends a vocational high school within Ota Ward, an area known for its family-run businesses and factories. He spends his days holed up in one of the high school's practice workshops, honing his muscles along with his Sacred Artifact techniques, as his guild views physical strength to be the basis of all skill. After losing his right arm in an unprecedented disaster involving a Gate, he replaced the limb with a prosthetic within which is housed his Sacred Artifact."

[[tokyo afterschool summoners]]

https://housamo.wiki/Kurogane#transient0
kajiya kurogane