飛羽真と賢人、マスターロゴスの前に現れたルナ。再会も束の間、ルナは消えてしまうが飛羽真はルナが生きていた喜びを噛み締め、賢人は戸惑う。そしてマスターロゴスは新たな禁書を開く。その本には古の不死の剣士・バハトが封印されていた。
「人がいるから、世界があるから、力があるから争いが起こる。全ては無に帰す」
剣士を次々と襲うバハト・仮面ライダーファルシオン。ユーリの口から語られるバハトの過去。そして、セイバーを巡って戦うファルシオンとカリバーを前にして最光がまさかの――。
Touma and Kento came face to face with Luna who appeared in front of Master Logos. Luna disappears suddenly, but Touma is exhilarated by the knowledge that Luna is alive, while Kento remains confused as to what occurred. Meanwhile, Master Logos opens a new forbidden tome, which contains the soul of the Immortal Swordsman himself, Bacht. "Where there are people in the world there will be those who seek power, generating endless conflict to maintain it. Eventually, everything will return to the nothingness." Bacht, Kamen Rider Falchion, leads successive attacks against the swordsmen, one after another, as Yuri tells the others all about Bacht's past. Just then, in the midst of Falchion's conflict against Calibur and Saber, Saikou is...!!
