There is a picturesque town named Qingshui. At the town there lived a lovely red fish whose name is Bubble because he is fat and looks like a real bubble. Bubble opens a convenience store, however, Boss Mai, who opens a supermarket, always plots against him. In order to earn more money, he carries out different kinds of plans to grab Bubble's market share. When facing all the difficulties, Bubble always keeps positive and meets the challenges with an optimistic mind. In the end, he overcomes all the difficulties and keeps his store running successfully.