Lack of lore on the Raen Au Ra

[Iscah]

- They are very spiritual (but of what religion, other than a general belief in kami, in the Far East?)

Worship of the kami is a religion in itself, not a vague spirituality in addition to something else. Specifically it is an import of Japanese Shinto, or something close enough to it that perhaps the writers don't see a need to go into further detail.