is a Japanese manga series written and illustrated by Hidekichi Matsumoto, began serialization in Kodansha's Nakayoshi magazine from December 2010.

[4][5] Taking place at Aogiri Academy, the series follows a group of female high school students and their daily lives in a survival game club.

An anime adaptation by Pierrot+, directed by Masahiko Ōta and written by Takashi Aoshima, aired in Japan between July 6, 2014 and September 21, 2014 and was simulcast by Crunchyroll.

Each Blu-ray Disc volume includes an original video animation episode.

by Ayaka Ōhashi, whilst the ending theme is "Pitty Patty Survibird" (ぴてぃぱてぃサバイバード, Piti Pati Sabaibādo) by Gesukawa Girls (Ayaka Ōhashi, Yumi Uchiyama, Rumi Ōkubo, Lynn, and Nao Tōyama).