Azumaterasu (アズマテラス) is a barrier shop located somewhere in the Human Village in the Sanctuary that specialises in building barriers. The apprentice barrier builder Tenkai Zuifeng works there.
Azumaterasu is Mugenri's barrier shop with an old and honorable history, located in the Human Village. It is a big mansion that looks similar to the Kyoto State Guest House. They are in charge of maintaining and repairing the "inner" Mugenri Barrier, appearing to have assigned each staff member to a particular area of the barrier. They can be assumed to offer barrier building services to those who need them.
Among their staff, it is known that there are mentor(s) as well as ordinary barrier builders, but power harassment is apparently a serious problem there. Tenkai Zuifeng is an apprentice barrier builder that has been shown to carry out their work.
Azumaterasu-ōmikami (東照大神), more commonly Tōshō Daigongen (東照大権現), is the "Great God (alternatively: Great Avatar) that Illuminates the East". He is the god that Tokugawa Ieyasu, the first Shogun of Japan, crowned himself to be before his death in 1616. Azumaterasu is considered to be the ancestor and guardian of the Shogunate family, and was created to counter Amaterasu-ōmikami (天照大神), the "Great Goddess that Illuminates the Heavens", who is considered to be the ancestor and guardian of the Imperial family. The Imperial family was based in the west back then, which is theorized to be the reason Azumaterasu is the "Great God that Illuminates the East".
The name may be a reference to the fact that Tenkai Zuifeng was one of the two dictative powers in Mugenri, the other being Tsurubami Senri, much like how the Imperial family and the Shogunate were the two ruling powers of Japan.
According to JynX, "Azumaterasu" is written as "吾妻照" in Chinese, which translates to "Light of the East", or alternatively "My Wife Illuminates".
- Reactivate Majestical Imperial
In Reactivate Majestical Imperial, Tenkai Zuifeng was sent by their masters at Azumaterasu to fix the hole in the "inner" Mugenri Barrier that Lumen Celeritas made in Earthen Miraculous Sword.