Gunpla Battle Nexus Online (GBN) is a new network game that allows players to participate in a range of missions employing Gunpla in a virtual cyberspace realm. Riku Mikami and Yukio Hidaka, two middle-school kids, team up with their friend Momoka Yashiro to explore this huge globe. They become "Divers," or residents of GBN, and encounter a mystery girl named Sarah, who has an incredible sensitivity to Gunpla. They start playing with her, but... There are other more well-known Divers, beginning with Kyoya Kujo, the champion whom Riku admires. Multiple Divers can join together to create a team known as a "force," while Mass-Divers employ unapproved tools known as break decals to disrupt the game. Riku and his buddies will construct not only Gunpla, but also other things as a result of their various contacts and experiences.