Yumi Yakamato is a priestess in Tokyo whose duty it is to hunt yokai, which are spirits that can be quite troublesome and dangerous. She has heard a rumour that there are men who go missing all night and then have no recollection of what happened... she suspects it is a yokai - a shiro ukari. She will hunt it down and send it back to the spirit realm before it causes any more trouble... through the use of her special sensual techniques! She'll scour the alleyways for men, and she won't know who is secretly the yokai until after she fucks them!