How to become a rock

Sinopsis Film

On a cloudy summer day, Mizo and Modu encounter a large rock that supposedly grants wishes, during their Cub Scout activities. After that day, Modu disappears without a trace. Mizo searches for Modu every day, but to no avail. Then one day, after a long time has passed, Modu returns to Mizo, and says, "I want to be a rock."