Gundam Build Fighters

Sei Iori is a talented Gunpla builder, but lacks the confidence to become an effective fighter in a Gunpla Battle. One day, he meets Reiji, a mysterious red-haired boy, who displays his exceptional skills as a Gunpla Fighter by defeating Susumu Sazaki with Sei's newly constructed Build Strike Gundam.

As Reiji copes with adjusting to Tokyo life, he picks a fight with school council member Monta Gonda. Sei and Reiji defeat Gonda in an exhibition Gunpla Battle, but are immediately bested by Tatsuya Yuuki and his Zaku Amazing.

Sei completes an upgrade to the Build Strike Gundam while Mr. Ral gives Reiji an orientation on Gunpla Battle.

Sei falls in love with a mysterious girl who is into Gunpla, unaware of her true intentions in Gunpla Battle.

Sei and China meet Mao Yasaka, a young Gunpla Fighter from Kansai Prefecture.

When Yuuki suddenly bows out of competition and takes an indefinite leave from school, Reiji begins to doubt his purpose in Gunpla Battle.

As a reward for winning the Gunpla Battle Japan 3rd Block Championship, Sei and Reiji, along with China, Rinko, and Mr. Ral, take a vacation at a beachfront inn. But their vacation is cut short by a former Gunpla Builder who threatens the innkeeper to give him their property.

Nils Nielsen, a 13-year-old genius, joins the American Qualifying Round of the World Championship to learn more about the secrets of Plavsky particles. Meanwhile, in Finland, Team Nemesis receives a new fighter named Aila Jyrkiainen from the Flana Institute.

China completes her Gunpla Beargguy III (San), and when a painting of it wins the grand prize at the local art exhibit, her rival Caroline Yajima issues her a Gunpla challenge.

As the 7th Gunpla Battle World Championships begins in Shizuoka, the Gunpla community is in shock when news spreads of reigning champion Carlos Kaiser's defeat at the hands of Aila. Meanwhile, Sei meets the other Gunpla Fighters at the opening party while Reiji encounters Aila at the nearby mall.