The Himenomiya Group is the most powerful corporation in Japan as of SU 10. It controls 76% of the share market on B Stone manufacturing, and is the chief funder of the United Students. In fact, the second U.S. Grand Chief and the Steward Grand Chief are both from the Himenomiya family.
The Himenomiya Group was originally Himenomiya Heavy Industries, a very successful company. When the Domonic Hole appeared, the accompanying collapse of the economy caused the temporary downfall of the company. However, it managed to start on the manufacturing and refining of B Stones ahead of the other corporations. This helped the company's revival and expansion into other businesses, forming the Himenomiya Group.