The area was built due to increasing demand for expansion due to growing industry in Tokyo and Yokohama. The area is located within a set of hills known as Tama Hills and has the Tama River as its north-eastern boundary.
- Tama City is based on the actual location in Tokyo, Japan.
- Santa encounters Mai at the Karakida Station in Tama city; a district in the western part of Tokyo.
- The christmas tree that Mai sits under in the manga is at Hibiya Park. In the real world, there is a fountain where the tree is located.