Type: OVA
Episodes: 3
Status: Finished Airing
Aired: Dec 22, 2011 to Jun 27, 2014
Producers: Majin
Genres: Hentai
Duration: 30 min. per episode
Rating: Rx - Hentai

The protagonist Takato Keisuke and 6 others are locked up in these hidden white rooms. His childhood friend Hokari Kanae, classmate Ando Miyako, underclassmate Mikaba Rika, English teacher Aoi Natsuki, same year Byakuya Rinne, and classmate Manaka Nemu. While still confused about their unusual situation, a "mystery voice" suddenly speaks to them: "A game has now started. In order to escape the room, Keisuke is the "unlocker" and one heroine the "keyhole". With an assigned act, he must "use the key".