One day, during the rainy season, a young man is about to take another person's umbrella from the stand in front of a convenience store. He suddenly feels someone's gaze, and when he looks up in the rain, he sees a mysterious fish hanging from a string staring at him... It doesn't speak, doesn't move, and doesn't change its expression... The name of this mysterious fish is Pisu-chan. Pisu-chan—a mysterious fish that doesn't move at all—livens up the store, surrounded by the mischievous store manager, the mysterious bugs who are good at their jobs, and the innocent but merciless children who come to play... This is the first volume of a laid-back and surreal fish work comedy about Pisu-chan and the convenience store.