Taimanin asagi is a four episode OVA released in 2007. Each episode is 28 minutes long. It is based on the visual novel of the same name that was published in 2011. The novel is one volume.
The city streets of Tokyo are more dangerous than they’ve ever been before. Humans and demons exist side-by-side, with a sworn trust that they will not harm each other. But some humans have disregarded these sacred pledges and have teamed with demons to form groups and organizations, bent on death, destruction, and unholy human tragedy.
To help quell this tide of evil, there exists a group of female ninjas who hunt down and slay those demons who mean to harm others. Asagi Igawa is one of these ninjas, or at least, she was. Her demon hunting days have been put aside in favor of being with her boyfriend, Sawaki. Unfortunately for the couple, (Taimanin) Asagi’s past is not as far behind her as she would like to think. Her previously defeated nemesis, Oboro, has somehow come back from the grave to get revenge.
Taimanin Asagi is a hentai that mainly contains the genres of tentacle, gangbang rape, and torture. Also be warned that there are scenes in which the girls pee or/and barf, especially in the later episodes.