After Team Build save the world from destruction, Sento and Sougo go look for the successor. A young Genius yet crazy kid named Shouki Aizawa, son of Eraserhead and Ms. Joke. One day, 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 accepts to become the next Build and a vigilante.