When a mysterious electro-wave human runs rampant through the city, the various women of the Kamen Rider universe gather together to stop her. But what does this attacker want? And is she connected to the letter Hana receives claiming to be from her true family?

All the incidents occuring around the Girls Remix up to this point were part of Sumire Kurono's plan to create the ultimate Kamen Rider. Now that plan is moving into its final phase. Sumire kidnapes Nayuta Mikazuki again. After performing her final surgery, "Kamen Rider Eins" is finally born. Will the Girls Remix be able to get Nayuta back? And what will become of Nayuta, who has become Kamen Rider Eins?

Rinne Kudo, who is studying abroad in England, sees her classmate kidnapped by Yoko Minato right in front of her. Rinne returns to Japan with Sophia's guidance, who is investigating a series of female kidnappings, and decides to investigate the case with Girls Remix. They head to the scene of the crime with Reika Shindai to investigate a case suspected to involve an alchemist. At that moment, Yoko appears again and attacks them, but a woman who looks like Clotho appears and fights Yoko. Will Rinne be able to solve the case and save her classmates?!

《假面骑士圣刃》电视剧最终话后一年，与神代家齐名的真理之剑名门望族之后——御手洗路易前来神代家提亲。为了妹妹玲花的幸福，神代凌牙命她放弃练剑去相亲。为了应付哥哥的相亲命令，玲花故意用很粗鲁的方式吃饭，想以此让路易讨厌自己。但是路易看穿了玲花的真心，告诉她自己一开始也对这门亲事不感兴趣，但是因为玲花的志向和自己守护世界秩序的志向相似，所以就接受了相亲，并向玲花求婚。玲花决定结婚，凌牙却日日烦恼这样好吗?在离举行婚礼还有一周的时候，凌牙接到了绯道莲的一个电话......

距离假面骑士圣刃的变身者神山飞羽真等一众剑士们拼命拯救世界已经过去8年的时光。飞羽真收养了因卷入大战而失去父母的少年小陆。他的好友间宫和编辑须藤芽依也一起帮忙照顾。飞羽真想弥补小陆失去的父爱，但是却无法治愈他的创伤，已经11岁的他仍然没有露出笑容。另一方面成为翻译家的富加宫贤人即将与立花结菜结婚，正过着充实的每一天。但是，就在此时，在剑士们的身边开始发生了奇怪的事情，圣剑的持有者接连消失。正在新堂伦太郎开始调查此事时，假面骑士霸剑 惊异塞壬突然现身。解除变身后的篠崎真二郎自称是伦太郎的父亲，让伦太郎心烦意乱。此外，贤人碰上了霸剑，小陆放学未归，前往寻找小陆的飞羽真也遭到了霸剑的袭击。惊异塞壬奇幻驾驭书中隐藏着怎样可怕的力量？时光荏苒，等待飞羽真一行人的是最大最后的苦难！

《假面骑士圣刃》（原文：仮面ライダー圣刃/Kamen Rider Saber）是东映株式会社出品的特摄电视剧。是“令和假面骑士”系列第二作。本作以“神话”与“书”为元素，敌人是来自不可思议的异世界潜入的魔物。