After the events of a war between Heisei Riders and Showa Riders, they settled their differences and moved on. A year later, there are four El Lords and other Lords have been revived by Foundation X who is secretly planning for destructing the multiverse, so they sent many Lords to the world of D×D with Devils, Angels, Fallen Angels, and other mythical creatures to eliminate them, while also finding Agito to kill in order to have revenge. Meanwhile, when Decade called a young man named Satoshi Fujimoto (also known as Kamen Rider Agito) about the bad news, he sent Satoshi to the world of D×D by saving it while also eliminating the Lords once again. This is his chance to fight the four El Lords in order to take their powers.