Nezumi no Sumō

Studio Ghibli released a 13-minute short film in 2010 titled Chūzumō based on this folk tale.

Upon waking the next morning, the old couple find both the rice cakes and the loincloths absent, and the old man excitedly prepares to go up the mountain to witness the next sumo match.

Surprised, he calls his wife and tells her they must have been left by the mouse from the rich man's house.

The two hurry to the clearing to watch the match, and see two fine, healthy mice in red loincloths grappling.

The old couple watch the match continue until evening, and then return home content that they have done a good deed.

[3] Hayao Miyazaki wrote a 13-minute fantasy animated short film, Chūzumō, in 2010.

[1][2] 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.