In the virtual world of Gunpla Battle Nexus Online (GBN), Gunpla enthusiasts can partake in diverse missions using Gunpla models. Riku Mikami, Yukio Hidaka, and Momoka Yashiro, classmates, join forces as "Divers" to explore this vast realm. Sarah, with her acute sensitivity to Gunpla, assists them in combatting the challenges of the game. The game also features prominent Divers, such as Kyoya Kujo, the reigning champion. While players can collaborate to form a "force," Mass-Divers who employ forbidden decals cause chaos in the playing field. Through various trials, Riku and his comrades not only perfect their building skills but also create their tale!