Azumanga Web Daioh is a short original net animation adapted from the manga by Kiyohiko Azuma. Directed by Hiroshi Nishikiori and animated by Ajia-do, it was made available for paid streaming on the Japanese character merchandise website chara-ani.com on December 28, 2000. The short had a completely original story and was intended to gauge whether there was enough interest to create a web-released anime adaptation. Because of overwhelming demand, however, the original plan for web-release was changed to a television release with new voice actors, music, and staff.
SPOILER WARNING: The story of this pilot has Chiyo bring a video camera to school for a project, only for Tomo to get a hold of it and get into shenanigans all over campus. Most of the short is from the perspective of the camera, and at the end we see Osaka bury a VHS tape of the footage in a time capsule, before it gets bulldozed by a waste management company doing construction.
Fumiaki Asano, Director: The original "Azumanga Daioh" already has well-established characters, so we aimed to create a work that would satisfy those who have read the original. I would definitely like people to watch this after reading the "Azumanga Daioh" manga. (Translated from interview)
In December 22, 2001, a six-minute trailer was released to movie theaters to publicize the then-upcoming television series, titled Azumanga Daiou: Gekijou Tanpen. When the anime series was released in the United States by A.D. Vision as a DVD set in 2005 (The same company that originally had the English publishing rights to the Azumanga Daioh and Yotsuba& manga), this film was included as one of the extras on the sixth DVD volume under the title The Very Short Azumanga Daioh Movie.
SPOILER WARNING: The short opens with Chiyo introducing herself to the audience, then cut to the classroom to get a few jokes showcasing all the characters’ main gags, which ends with the reveal that the whole short was one of Osaka’s dream sequences which she of course wakes up from, thus ending the short. During the credits we watch a spinning 3d model of Chiyo’s father, accompanied by a song sung by Chiyo’s voice actress, Tomoko Kaneda, titled “Sarabai!”.
To celebrate the tenth anniversary of the manga, three 16-page chapters serialized in the magazine Monthly Shōnen Sunday starting in May 2009 under the title Azumanga Daioh: Hoshuu-hen, which translates roughly to “Azumanga Daioh: Supplementary Lessons.” These would later be compiled in the 2009 reprint of the series released in Japan by Shogakukan also to celebrate the tenth anniversary. While the original series was released across four volumes, the reprint was instead released in three volumes, correlating with each of the three school year arc. In turn, each volume included one of the supplementary lessons chapters from from the anniversary.