Dewy's Adventure: Suishou Dewy no Daibouken!!
This game is titled Dewy's Adventure in North America and Dewy's Adventure: Suishou Dewy no Daibouken!! in Japan.
Successfully complete Groovy Grasslands to have the
following options appear in the village in Story mode: Character
Gallery, Hall of Records, Music Gallery, Photo Gallery, and Tips
Dewy's theme song, called "Rainbow Smile" in the game, can be unlocked in the Music Gallery after completing the game. You can then listen to it at any time.