Two years have passed since the legendary force Build Divers battled the second Coalition of Volunteers to save the EL-Diver. Gunpla Battle Nexus Online (GBN), where these events took place, has been upgraded to provide sensory feedback for more realistic play. But as GBN becomes even more exciting, there are Divers who play with their own motivations in mind. Hiroto is a Diver who wanders alone through the Dimension, playing as a mercenary. Kazami is a frivolous, independent Diver who joins one party after another, pursuing the one he admires. May is a solo Diver surrounded by an aura of mystery, who plays Gunpla Battle night and day. And Parviz is a lonely novice Diver who is interested in team play, but out of shyness, he has never managed to seize the opportunity. Each of them is alone, but the course of events will end up uniting them into a new team of Build Divers. What awaits Hiroto and the others is a boundless super-experience that far transcends GBN.