珠と竜鱗 / うしろむき出版

(All is written by Japanese, no translation)
12 y.o. boy Koukichi Azumada was kidnapped by a mining company under the global monopoly when he was 10,
and they planted the body of dragon on him and forced him to subdue the grave robbery by the rival companies
at the alternative world.

One day Koukichi finds that the rivals tries to rob the huge amounts of metals and moreover try to blast an elementary school in our world.
In order to stop the blast and make his dream to go back home, he fights in the corporation with his subordinate
younger boy Naohiro Kojima.

All is open for free on pixiv, without the appendix transfur short comic (3 pages).
https://www.pixiv.net/artworks/85768922