It was announced that "Koroshiya-san
", a 4-koma gag manga about an assassin who boasts he can kill "anything", will get an anime adaptation. The anime will be made by Opera House, a flash anime studio. The manga started serialization in Manga Action in 2004 and four volumes have been published. It also got a drama CD adaptation in late 2009.
Anime official website: http://www.5648.jp/
Source: Moca News
Koroshiya-san: The Hired Gun