Kalawarner is a Fallen Angel who allied herself with Raynare in her plot to steal Asia's Sacred Gear.  In the anime, Kalawarner attacked Issei after the latter's first errand as a Devil (visiting one of Koneko's regular clients, Morisawa). Although she had the upper hand, she was forced to retreat when Issei activated his Sacred Gear (in its then-Twice Critical state) for the first time.   Later on, she, along with Dohnaseek and Mittelt, fought against Rias and Akeno during the Occult Research Club's mission to save Asia from Raynare.  ~!She was terminated by Rias' Power of Destruction after making fun of Issei for how he was treated by Raynare (then as Yuuma) on their first date, which provoked Rias.!~ (Source: High School DxD Wiki)

Issei Hyodo is your average perverted high school student whose one wish in life is to have his own harem, but he's got to be one of the unluckiest guys around. He goes on his first date with a girl only to get brutally attacked and killed when it turns out the girl is really a vicious fallen angel. To top it all off, he's later reincarnated as a devil by his gorgeous senpai who tells him that she is also a devil and now his master! One thing's for sure, his peaceful days are over. In a battle between devils and angels, who will win? <br><br>
(Source: FUNimation) 

She is a voice actress who formerly affiliated with Arts Vision and is now affiliated with Amuleto.

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