Devils that lurk within humans, and family that is deemed irreplaceable to humans. With these two words, a new story in which familiar characters clash with passion. After a long battle, the Igarashi Family and their friends have finally achieved peace. However... a new threat that transcends Giff, the progenitor of the demons, has appeared.

When the evil Olteca makes a contract with a man and unleashes the Spider Deadman, Ikki Igarashi transforms into Kamen Rider Revi to stop them. At his side is Kamen Rider Vice, a devil that lives inside his mind that he has made a deal.

五十岚元太与幸实在《剧场版 假面骑士Revice》中遭遇劫机事件。而那起事件发生前，在别的城市也发生了不同的事件───。在两起事件的背后，隐藏着一个恶魔，以及名为「Chimera」的假面骑士。他究竟是何人呢？

劫机事件发生！！被主谋Azuma囚禁于禁断之地・Area 666的元太与幸实。五十岚三兄妹为了拯救爸妈，前往禁断之地。挡在三兄妹的Azuma变身成假面骑士戴蒙Daimon，判决人类的存亡。 与此同时，在元太与幸实面前出现的神秘科学家-外海揭开了目的，追迫五十岚一家。设下的陷阱导致最大的危机迫近时，最强一家的牵绊产生奇迹ーー！