Overview
The baby owl, On, is afraid to go out into the world. Because On is afraid of sounds from outside the world, such as the sound of cats and crows. However, He happen to know that if he wears a mask made by Gaks, the master of the mask, the sound appears in the form of a figure so that he can see it with his eyes. On meets Gaks and says he wants to see the world with wearing the mask.