Azumanga Daioh: The Very Short Movie
Azumanga Daiou: Gekijou Tanpen · あずまんが大王（劇場短編）
Synopsis
In this short movie featuring familiar characters from Azumanga Daiou, Osaka is yet again having a strange dream of Chiyo-Chan's pigtails being posessed. As Chiyo-Chan's pigtails bounce out of the window, who knows if young Chiyo will ever be happy again. (Source: Anime News Network)
Studios: J.C.STAFF, ADV Films, Kadokawa Shoten
Source: MANGA