闇の剣士・カリバーは賢人の父親だった。しかし、その事実を飛羽真はまだ知らない。そんな飛羽真の前に新たな剣士が現れる。明らかに自分より年下の緋道蓮に格下扱いされて内心穏やかではない飛羽真。賢人を慕う蓮は、飛羽真が賢人の幼馴染みだと知りライバル心を燃やす。そんな中、ストリウスとデザストが動き出し飛羽真に迫る。一方、ズオスと遭遇した倫太郎と芽依は…。
The swordsman of darkness, Calibur turns out to be Kento's father! However, Touma is still unaware of this fact! Just then, a new swordsman appears before Touma! Ren Akamichi, a hot-headed individual compared to Touma, is significantly younger than him too! Ren, who seeks out Kento's recognition, discovers that Touma is his childhood friend and a fierce rivalry then emerges between the two! Meanwhile, Storius and Desast make their move upon Touma, while Rintaro and Mei encounter Zooous...!
