Happy Seven (はっぴぃセブン ～ざ・テレビまんが～, Happy 7 ~The TV Manga~?) is an anime series which consists of 13 episodes that began airing in Japan October 2, 2005. The original story was by Hiroyuki Kawasaki. It was directed by Tsutomu Yabuki and produced by Studio Hibari and Trinet Entertainment.

Source: Wikipedia