: Sei is pressured by a rival named Sazaki , who wants to use Sei's superior Gunpla for himself.
The first episode of , titled " Sei and Reiji ," originally aired on October 7, 2013. It serves as a vibrant introduction to a world where "Gunpla Battles"—simulated combat using plastic Gundam models—have become a global phenomenon. Episode 1: " Sei and Reiji " Summary
: You can watch the full series on Crunchyroll or via Prime Video .
Watch the first intense battle between the Build Strike Gundam and the Gyan here:
The premiere introduces , a talented Gunpla builder who lacks the piloting skills needed to win battles. His life changes after a chance encounter with Reiji , a mysterious boy with extraordinary natural piloting instincts. Together, they form a team: Sei builds the models, and Reiji fights with them.