Gundam Build Fighters: GM`s Counterattack

Gundam Build Fighters: GM's Counterattack (Japanese: ガンダムビルドファイターズ GMの逆襲) is a 2017 original net animation (ONA) set between Gundam Build Fighters and Gundam Build Fighters Try. The story takes place the day before the completion ceremony of the Yajima Stadium, where Nils Nielsen invites Sei Iori, Meijin Kawaguchi, and others to an exhibition battle using his new large-scale battle system. When everyone reunites, Sei is about to show off his upgraded Build Strike Cosmos for the exhibition but finds it missing. Meanwhile, someone takes control of the stadium's systems, trapping Sei and the others inside. A mysterious group appears and challenges them to a Gunpla Battle. Produced by SUNRISE, it is directed by Kenji Nagasaki, written by Yousuke Kuroda, and features character designs by Kenichi Ohnuki. The ONA was released globally on August 25, 2017, with one episode lasting approximately 32 minutes. It follows Sei Iori and his friends as they battle against the villainous Gunpla Mafia, while showcasing new Gunpla models and battle systems.