https://youtu.be/mqXEhkOtnxU

The powerful tome that Storious have stolen from the Southern Base's forbidden library was now in Touma's hand, which it was reacted to the latter, causing the tome to transformed into the Primitive Dragon Wonder Ridebook (プリミティブドラゴン ワンダーライドブック Purimitibu Doragon Wandā Raido Bukku). However, its power is too strong and even makes Touma go berserk when he transforms into Kamen Rider Saber Primitive Dragon (仮面ライダーセイバー プリミティブドラゴン Kamen Raidā Seibā Purimitibu Doragon).

Reika informed the other swordsmen of this development and demands them to retrieve the book at all costs, even if it means eliminating Touma in the process, which Ogami opposes before Reika informs him the orders came directly from the Master Logos himself, leaving Ogami no choice but to accept it despite struggling with the nature of the request.

Later, Ogami approaches Touma and asked him to fight without holding back as Mei and Sora stare at the ongoing battle. Who will win in this fight?

Meanwhile, Legeiel, who was completely devastated by Kamen Rider Saber Primitive Dragon's vicious attack, has focused his attention on another vengeful fight against Saber...

This marks the return of Kamen Rider Calibur. But, there is one thing I've been thinking... Who will the one who wielded the power of Dark Swordsman Kamen Rider Calibur?