Ingrid is a lovely and stern demon-hunter who fights under the command of Edwin Black in the Demon City Tokyo.
Ingrid was a member of a secret organization of humans that was allied with the demons. She was known as the Dark Knight. Under the command of Edwin Black, Ingrid was assigned to capture the Anti-Demon Ninja Murasaki Yatsu. Though, the scientist Kiryu had revealed he already abducted her. She had already suspected Kiryu to be a traitor and was just using his Black's organization to fulfill his vengeance.
Ingrid is one of the main characters from the Taimanin Asagi game series that was created by LILITH. and the character design by Kagami. She's from the spin-off CD-Rom game titled "Taimanin Murasaki ~ Kunoichi Kairai Dorei ni Otsu ~". The game was released in Japan on October 31, 2008. Taimanin Murasaki was later adapted by PIXY into four part anime OVA titled The Dark Knight Ingrid. The anime started releasing in June 2009, and is directed by Tsukasa Kaidou.