Based on the adult game by Anime Lilith.

The Taimanin Asagi series of erotic visual novels is a must-play for anyone who loves to see strong and sexy women succumb to the pleasures of the flesh. In this action-packed third installment, enjoy many hours of tentacles, monster sex, Ninja fighters, BDSM, and all sorts of other juicy fetish material starring the smoking hot Asagi and her demon-hunting ninja comrades.

(Source: J-List)