Borrowing Suzuha's airship, Gao and his friends travel to Sengoku Academy, a supremacist school in the mountains where everything is resolved through Buddyfights. On the way there, the group is attacked by the monster Sky Ninja, Yamigarasu but saved by the timely appearances of Genma and Duel Sieger. The team lands within Sengoku Academy and are challenged by several Sengoku students. Gao and his friends beat them all in Buddyfights, and they are later given a tour of the school by Shosetsu Kirisame, who is one of the "four demon generals" of Sengoku Academy. After meeting with the other three generals (Raremaro, Kanahebi, and Kemura), Rouga appears and Gao demands to know where Kiri is. Then, Rouga has Gao and his band of friends engage in a 5-vs-5 Waseda style of Buddyfight with Rouga teaming with the four generals.