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Additional information has been released in regards to the OVA. Madhouse Studios (Death Note, Black Lagoon, Trigun, The Girl Who Leapt Through Time) will be producing the animation with Araki Testuro (Death Note) as director, Kuroda Yousuke will handle the series composition, and Tanaka Masayoshi (Toradora!) will provide character designs.
Source: newAkiba.com