It's time for the annual school festival and everyone is deciding what to do. Sorges sends Sushi, an evil sushi chef, to destroy Chacha. Banana Class decides to doing a cafe would be fun. Riiya's giant grandfather shows up and offers to make sushi for everyone, with Riiya telling everyone what a good sushi chef he is. However, he is out of everything but egg. Marin summons all kinds of seafood and Riiya's grandfather makes a lot of giant sushi for everyone and Marin goes back to her class...