The little mouse took advantage of the balloon's hippo uncle to take a nap, bit off the string of the braided balloon, grabbed the balloon's tail and ran away. The balloon was very buoyant, and the little mouse took a nap while being carried by the balloon. The little mouse held the balloon and floated, floating over the roof, over the treetops, over the hills, and through the clouds. He overcame his fear, and then he thought: simply leave this city and go find the legendary Treasure Island where he can live a carefree life.