Tetsu, who is an active solo player at GBN, met EL Diver Rize who suddenly appeared beside him! As EL Divers are a rare and valuable occurrence in GBN, Tetsu is entrusted by the game officials to become Rize's caretaker and help him survive in the human world. Together, they will rise to the top and become the champion of GBN!

This series is a side story to the anime series Gundam Build Diver ReRise.