In a secluded mountain dwelling, an elderly couple labors tirelessly in the fields day by day. One evening, the old man stumbles upon a peculiar sight of mice scurrying purposefully into the night. Intrigued, he shadows them to discover a secret sumo tournament among the mice community. Determined to help their losing home team, the couple prepares a lavish feast of saury fish dumplings and grilled tofu with miso sauce. Additionally, they craft vibrant red sumo attire for the mice. As the next sumo matches approach, the stage is set for a showdown unlike any other. What surprises and victories await in the upcoming tournaments?