Bandai visual launched a new 30 second promotional trailer of this OAV about four prisoners and a cat, in which a sudden power outage opens the locks and everyone is mysteriously set free from their cells. However, all of the guards are missing, and the prisoners cannot find any exits.The trailer for the OAV can be found here
For being a one-shot, it is quite a big project done by the animators at Sunrise studios, with Hiroaki Ando (Digital Juice, Steamboy & Tekkonkinkreet CGI director) directing, writer Dai Sato (Freedom, Eureka Seven), Masaru Gotsubo (Shounen Tantei Inugami Geru, Samurai Champloo manga) and Kimitoshi Yamane (Escaflowne, Cowboy Bebop), who is responsible for the character and mechanic designs.
The premiere will be in theatrical screenings on January 22, 2011.