Gundam Build Fighters

Having met Sei by chance, the mysterious boy Reiji insists on staying at his home and somehow even ends up coming to his school. And when Gonda, a student council executive, tries to kick out this intruder, Reiji turns the tables on him as well. Tatsuya Yuuki, the student council president and head of the model-building club, attempts to resolve the situation by saying that he invited Reiji to join the club. But Gonda, having lost face in front of the other students, challenges Reiji to a Gunpla battle purely for revenge. Using Sei's Build Strike Gundam, Reiji wins a total victory in his battle with Gonda. Then a crimson Gunpla appears before them both—the Zaku Amazing!