Kasuga

The Kasuga are spirits who come to the Bathhouse in groups by ferry. They wear strange masks and Sokutai (traditional clothes worn by the Japanese nobility), but their bodies are made out of shadows.

Kasuga is the name of a famous Shinto Shrine in Japan. There is a traditional ritual dance called "Ama" at Kasuga Shrine, in which the dancers wear paper masks called "Zoumen." The mask looks like the one Kasuga-Sama is wearing.