After having eaten at a restaurant instead of at the Tendo Dojo, Ranma, Genma, Soun, Nabiki and Akane return to find a knife seemingly stabbed into the floor along with a broken vase. They group then believe this is because they told Kasumi not to make dinner for them, when she had already started cooking it, so she's gotten mad (something none of them, not even Soun, has seen before). This causes them to go into a panic as they prepare a party to cheer up Kasumi, while also trying to avoid her as well.