Murasaki Yatsu is a demon-slaying ninja in Demon City Tokyo along with the Dark Knight Ingrid. She wields a massive battle axe. source : animevice

Pixy's adaptation of Taimanin Murasaki (or Hell Knight Ingrid), the third Taimanin Asagi game by Black Lilith. 
Said to share the same animators as those who worked on Aniyome wa Ijippari.

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)

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She is a voice actress currently affiliated with Yellow Tail.

Japan, sometime in the near future where a group of shinobi have been brought together and trained to deal with the demon threat that has persisted for some time. It has long been the case that demons and humans avoided each other, but that belief is about to be destroyed.

Things to expect are as follows: (probably racist) elves who no longer have males in their species to propagate, a confrontation between an angel and a demon, a story about an android, a shrine maiden who keeps a gate sealed, cowgirls, a captured anti-demon ninja, more ninja action, an angel sneaking into hell as a spy, and a princess knight. Expect some minds being broken people. 2/10 on the otaku scale, worth a peak at the ways you can take the writing and the artwork isn't bad. 
(Source: Shiro Hakase)