覚悟を決めた倫太郎が遂に動く。芽依に飛羽真たちの元に戻ると決意を告げるが、その前に剣士としてのけじめをつけると単身、マスターの元へ向かう。それを聞いた飛羽真たちは、倫太郎の身に危険が迫ると考えサウザンベース に乗り込もうとする。マスターロゴスと対面し真意を問いただす倫太郎。マスターロゴスが語る真の目的とは。そして、倫太郎の前に新たな剣士が立ちはだかる。神代凌牙、またの名を仮面ライダーデュランダル！非常な剣士の刃が倫太郎に迫る――。
Rintaro who decided to finally make his move, advances. He tells Mei that he will return to Touma, but before that, he goes to face Master Logos alone to determine the truth as a swordsman. Upon hearing this, Touma and his colleagues think that Rintaro is in danger and try to rush the Southern Base. Rintaro meets Master Logos and asks him of his true intentions. What is the true purpose of Master Logos? A new swordsman stands before Rintaro. His name is Ryoga Shindai, also known as Kamen Rider Durendal. He notices as the Seiken from that very same swordsman starts to point towards Rintaro.
