is a 2010 fantasy animated 13-minute short film written by Hayao Miyazaki and directed by Akihiko Yamashita. It is based on a Japanese folk tale, . It was produced by Studio Ghibli for the Ghibli Museum in Mitaka.
An old farmer discovers a group of rats heading to a sumo wrestling bout. After they lose miserably, he decides to feed the rats to boost their chances of winning.
Chà «zumà  was written and planned by Hayao Miyazaki, with storyboards by the director of the film, Akihiko Yamashita. The storyboards took three months to complete. The story is based on a Japanese folk tale, . The film depicts scenery and locations based on actual places in Nagano Prefecture.
It premiered at the Ghibli Museum on January 3, 2010. This was Yamashita directorial debut, andâÂÂat the time of its releaseâÂÂit was the first film by Studio Ghibli to premier at the Ghibli Museum in four years. As part of the promotions for the film, wrestlers from the Arashio stable, including à Âyutaka Masachika, were invited to the museum where they held a sumà  tournament in front of a group of children.