On the way home from school, Noboru and Sakura stop by a bookstore where they meet up with Kou and Kuugen. On discovering that Kou came there to get a book by which she could teach herself to cook, Sakura invites herself over to Noboru's place by offering to teach her. Kuugen is bribed by the offer of a homemade chocolate cake. Later when Sakura drops by, Kuugen manages to disrupt the entire cooking process by coating the entire kitchen with cocoa as a part of her research into the chocolate cake's ingredients...