Langnyanniichuan

One of the island's Jusenkyou Springs, Langnyanniichuan, which is also referred to as the wolf-girl spring, grants those that are doused in its waters the form of a female with some wolf-like attributes. These most commonly seem to include a tail, lupine ears, and occassionally fangs. The Langnyanniichuan pool grants no further abilities, although like many pools, some who have bathed in it appear to have a psychosomatic response wherein they try to emulate the lupine spirit.

Folklore

Local legends seem to associate Langnyanniichuan with Engetsu, the deity of the Second Moon. This would mean that Jusenkyou-blessed wolf-girls were historically servants or worshippers of Engetsu.