 A thirty-minute, uncensored, single-episode original video animation (OVA) was released on September 12, 2007, available both on the anime's official website and in a limited edition version bundled with the fourth volume of the manga.The anime series, directed by Eiji Suganuma, written by Mari Okada, and produced by the animation studio Studio Barcelona, was originally scheduled to premiere in Japan on October 11, 2007, but two television stations—TV Saitama and Mie TV—removed it from their broadcast schedules.In an official press release, TV Saitama stated that their decision was heavily influenced by the then-recent capture of Takayuki Hosoda, a notorious Japanese child pornographer who was revealed to be an elementary school vice principal.