It's the school Cultural Festival and Yuuhi, Karen, Fuyuhiko and Tsukasa (along with the rest of their classmates) are doing a Yakisoba café. However, they face tough competition from the Yakisoba stand put up by Minato and the tennis club. Meanwhile Jun'ichi is kidnapped by Mitsuki, Nagomi and Mr. Sugishita for secret training regarding a dangerous mission. Back at the Yakisoba café the girls end up wearing their school swimsuits to attract business and end up triumphing over the tennis club's Yakisoba stand. At the end of the festival everyone is called out to the school track field to witness Jun'ichi's epic battle in his "Big Genokiller" against a robotic octopus.
学園祭で心躍る生徒たち。準一たちのクラスは焼きそば屋をやるというのだが、料理オンチの優姫と、若干勘違いをしている華恋の二人によって焼きそばがとんでもないことに…。そんな頃、準一は観月たちに拉致されて、とある特訓を受けることになるのだが…。
