Tokyo International Anime Fair
"Casshern Sins" was first announced at the Tokyo International Anime Fair 2008, where it was confirmed that Madhouse would be in charge of the animation. Soon after, an official trailer was posted online on its official Japanese website. It was announced at Otakon 2009 that Funimation Entertainment would produce and distribute the series for release in 2010, following a subtitled-only release on their video service in late 2009.