In a picturesque town, a huge dam lies in the middle of a distant valley. There is a windmill in the center of the dam, where the dam keepers who have been passed down from generation to generation live. Every morning, the piglet gets up and turns the heavy and huge device, using the wind to blow away the darkness that is eroding the town at any time, so that the sun shines in every corner. But he is dirty all over, and he has been living alone for many years, so his classmates at school are unwilling to associate with him, and even deliberately bully him. Until one day, the piglet's life changed. The cute and well-behaved little fox transferred here. She draws excellent sketches, especially good at vividly showing the characteristics of others. The fox seemed to have noticed the bullied piglet early on. She helped this poor guy several times, and made him experience unprecedented fun in the world of painting. A smile gradually appeared on the piglet's face, but an accident destroyed his friendship with the fox and everything in the town...