Hanakappa Special: Bokura no Daibouken

An adult member of the Kappa tribe has contracted a legendary disease that causes the flowers on his head to stop blooming. To fix it, it is said that pollen from the Papon flower, which blooms only on Papon Island, located at the end of the eastern sea, is needed. In order to help the adults, Hanakappa and his friends set off for Papon Island.