is a 2011 Japanese anime

Anime

is the Japanese abbreviated pronunciation of "animation". The definition sometimes changes depending on the context. In English-speaking countries, the term most commonly refers to Japanese animated cartoons....

 original video animation

Original video animation

, abbreviated as media , are animated films and series made specially for release in home-video formats. The term originated in relation to Japanese animation...

 release. The OVA was directed by Hiroaki Ando, written by Dai Sato

Dai Sato

is a Japanese screenwriter and musician.Having begun scriptwriting at a young age and writing scripts for various companies, Satō later focused his attention on writing for anime series...

 and produced by Sunrise

Sunrise (company)

is a Japanese animation studio and production enterprise. It is a subsidiary of Namco Bandai Holdings. Its former name was Nippon Sunrise, and prior to that, Sunrise Studios...

. It is licensed in North America by Sentai Filmworks, it will be released alongside another Sunrise OVA Coicent

Coicent

is a 2011 Japanese anime original video animation release. The OVA was written and directed by Shuhei Morita and produced by Sunrise. This story takes place in 2710 when a boy named Shinichi follows a White deer and falls in love with a strange girl...

 on DVD and Blu-ray on November 22, 2011.

Plot

In an isolated prison, there are only four prisoners and a cat. One day, a power outage opens all the locks and all of the prisoners are released. However, all of the guards are nowhere to be seen and there are no exits. An extrodinary event occurs in response to the old man's strange behavior.

Characters

His codename is Pokerface, also identified as N17.

Her codename is Sting, also identified as R21.

His codename is Pinch-Hitter, also identified as N35.

Her codename is FlashTradeKiller, also identified as R21.

His codename is Enplein, also identified as VO.

The Cat