Tatsunoko Production
is a Japanese animation studio located in Nerima, Tokyo Prefecture. It was established on January 29, 1999 by Nagateru Kato, a former animator from Tatsunoko Production. They have produced a number of series to date, most notably their adaptations of "School Days" and "High School DxD", among others such as "Hand Maid May", "I My Me! Strawberry Eggs", "UFO Ultramaiden Valkyrie", and "Kannazuki no Miko".