MF文庫J
, is a Japanese light novel series by Isao Miura, with illustrations by Luna. All 16 volumes have been published by Media Factory under their MF Bunko J label. A manga adaptation by Kōtarō Yamada started serialization in the seinen manga magazine "Monthly Comic Alive" on March 27, 2009. The first "tankōbon" was published June 23, 2009. A 12 episode anime adaptation by Manglobe studios aired from October 3, 2009 to December 19, 2009.