Gundam Build Fighters Sei lori is a young man who dreams of joining the 7th Gunpla Battle World Championship, aiming to follow in the footsteps of his father to become the best Gunpla fighter in the world. There's just one problem: he has poor battle skills. Sei can build high performing Gunplas, but he can't control any of them. To win a battle, he will need something more than just his amazing craftsmanship. Things begin to shift when Sei meets Reiji, an odd boy who seems to know nothing about Gunpla battles. However, during his first fight, Reiji proves to have a natural talent for the sport. The two soon join arms, signaling the beginning of their epic journey.