Angel Beats! is a collaboration project of Key, Dengeki G's, and Aniplex. First published as a series of short stories which later spawned a 13-episode anime series and later manga spin-offs and prequels. Rumors of a game release existed since 2010, but a formal game announcement was made in 2013. The game will have multiple releases with first volume set to be released on 29th of May 2015.