While staying at Familia to discover the true form of the nostalgic dish that Grandma Sachiko made, Hayato's fiancée(?) Princess Olivia thanks everyone with a home-cooked meal, but this only serves to ignite the rivalry between her and Shiragiku, who challenges her to a cooking showdown! With a fiancée from another land, the mysterious flavor of nostalgia, and another trip to the beach… It's turning out to be an unforgettable summer!