Shirasawa Sakuya♀

Sakuya is introduced to our protagonist as a girl that is looking after the Shirasawa convenience store in the residential area. She eventually reveals herself to be a hakutaku, and proves to be powerful enough to make herself corporeal (unlike other youkai, who can only be seen by Keiji). As a hakutaku, Sakuya has the ability to make predictions and is quite knowledgeable overall.

[From Moroboshi Yuumei's review]