Follow Xiaoyu for a walk, shuttle between the alleys full of flavor, put on childlike filters, pick up imaginative little fun in ordinary daily life. Xiaoyu helps dad go out to run errands to buy eggs, along the way, she follows a kitten. The kitten's shadow "walks on the roof" for a while; she sees through the marbles and becomes a small fish in the blue sea; she puts on the glasses that have been forgotten under the tree, and she turns into mother number two... The little fish in the story is naughty and cute. The lively posture vividly shows the child's contentment, and reveals the most innocent childlike imagination in the ordinary and familiar daily life.