[Kamen Rider Build x Marvel Universe Crossover!] After Team Build save the world from destruction, Sento and Sougo go look for the successor. A young Genius yet crazy kid is a scientist in his science club alongside his idiot companion. One day, when he gets back to his home after school, suddenly a portal sucks him inside and lands in the void. He meets Sento Kiryu and Sougo Tokiwa who tell him that Evolto is back to take over the new world with his new ally. He accept to become the next Build and send to another world called Marvel Universe. Now watch him to fight many enemy and meet allies as the next hero of love and peace known as Kamen Rider Build. READY, GO!