TNK

TNK Co., Ltd. is a Japanese animation studio owned by Toei Animation. 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.

Works
A list of series produced or co-produced by TNK.

OVA

 * Cosplay Complex (2002)
 * Cosplay Complex: Extra Identification (2004)
 * Papa to Kiss in the Dark (2005)
 * Itsudatte My Santa! (2005)
 * School Days: Valentine Days (2008)
 * High School DxD OVAs (2012, 2013 & 2015)

ONA

 * Busou Shinki (2011)