Kowarekake no Orgel (こわれかけのオルゴール, lit. "Half-broken Music Box") is a one-episode Japanese dōjin anime original video animation produced by ElectromagneticWave and directed by Keiichiro Kawaguchi. It originally debuted on December 28, 2008 in the Comic Market 75 dōjin convention. The official DVD version first released on December 31, 2009 in a limited first edition and special limited edition. The OVA is being adapted into a 34 minute film, set for release on September 9, 2010, which will use the original cast. The movie will include a 7 minute, 30 second side story not present in the original anime.