Kero Kero Keroppi no Dai Bouken  

Keroppi in the Big Adventure, Hello Kitty and Friends: The Big Adventure, Keroppi and Friends: The Big Adventure, けろけろけろっぴの大冒険, Kerokeroppi: The Big Adventure Mystery of the Bellybutton

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