While at a seafood market looking for fillings for their dumplings, Yoichi and his friends encounter Tonomine and Shigeru. While Tonomine is full of confidence, Yoichi finds a powerful ingredient - crab eggs - and begins the final filling. Yoichi's idea is to make dumplings with four ingredients: tomatoes, shiitake mushrooms, red chili peppers, and crab eggs.