TAIKO NO TATSUJIN: 15 SHUUNEN KINEN SHORT ANIMATION

Toshio Suzuki and Studio Ghibli produced the short to commemorate the 15th anniversary of the Taiko no Tatsujin (Taiko: Drum Master) rhythm game series. The short features Taiko no Tatsujin characters Don-chan and Kacchan, as well as an original mouse character. The short will also be broadcast as a TV ad later. (Source: Anime News Network) — Description from AniList community (anilist.co).