Very little is publicly known about Ryu Mizunagi but the author's birthday is March 23rd. Originally from Aichi, Mizunagi won the Kodansha Four Seasons Manga Award in 2004 with the pilot for Witchcraft Works. Mizunagi was able to continue the project through Kodansha Japan in 2006.
With a title like this, where catgirls are throwing around evil bunnies and our heroine decided to get intel by tying everyone to a stake and torturing them, a sense of humor is essential to not have it tip over into self-parody, and this strikes just the right note. A Case Suitable For Treatment