Kerokero Keroppi no Daibouken
English title: Keroppi in the Big Adventure
Japanese title: けろけろけろっぴの大冒険
Type: OVA
Episodes: 1
Source: Other
Genres: Adventure, Fantasy
Producers: Sanrio
Duration: 10 min
Rating: G - All Ages

When Pocapon's belly button gone missing, Keroppi, Den Den, and Ruby go to find it as without it he is unable to play the drums.