牙的世界。Fangire和人类在这里和谐相处。门矢士遇到了一个拉小提琴的少年——渡。当渡知道门矢士是decade后，变身成牙，向decade发起攻击。双方展开了激烈的战斗……。

牙的世界。Beetle Fangire从渡手中夺取了牙铠，成为了新的王。甲虫宣布他将放弃芳吉尔的规则并吞噬人类。 佑介说服渡成为王，但渡……

When Natsumi realizes that this is the world from her nightmares, she becomes wary for Tsukasa's well-being. Finding him in a tuxedo and feeling that this is the final chapter to their journey, they witness Wataru and Kazuma leading their respective Rider/monster groups against each other. After Rising Ixa and Leangle are killed off in the fight, Tsukasa makes his way to Wataru as he grieves over Ixa's death. Meeting the Fangire Queen Yuki, they learn from Wataru that the Riders are fighting each other to maintain the existence of their worlds.

After fighting off the Riders, Super Apollo Geist takes Natsumi to be his new bride as he flees. Kazuma Kenzaki appears, saying that Tsukasa's existence is the real cause of the worlds blending before confronting him as Kamen Rider Blade in King Form in order to force him to leave the world at once with Asumu keeping Yusuke and Wataru from interfering as Decade is easily defeated.