The Son of Decade will now start his own journey but before he could go to the new rider worlds he must first go to other ones and train until he is ready to go there, will he be able to make his parents proud and be the new savior of the multiverse.
This story is based on the Superior Spider-Man comics except instead of a brain switch like Ock did with Spider-Man it was an Akuma change in which Michael Troy better known as Shadow Spider got Akumatized during a mission with Ladybug and their team and when he became Akumatized he turned into a very powerful villain...
Many years after the events of Kamen Rider Build, Sento would have a son, Shinji, and would give him the Build driver, and Bottles. Shinji would later move to, New York, and become it's protector.