Mittelt is a Fallen Angel who allied herself with Raynare in her plot to steal Asia's Sacred Gear.  In the anime, she was ordered by Raynare to stand guard at the back of the abandoned Church. She was soon confronted by Rias and Akeno and fought them alongside Kalawarner and Dohnaseek.  ~!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 made Rias angry.!~ (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) 

__Agency:__ I'm Enterprise

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She is a voice actress currently affiliated with I'm Enterprise. She graduated from the narration school Nichinare.