Kiwame Quest bills itself as a full-dive RPG that recreates "reality to its extremes," and high schooler Hiro Yuuki finds out exactly what that promise costs after game-shop manager Reona Kisaragi sells him a copy: in-game damage causes real pain, wounds take real days to heal, and the plot alone tracks over ten quadrillion flags. Hiro pushes through what might be the most punishing game ever designed, chasing nothing but the accomplishment of clearing it. This light novel is the original story behind the Full Dive manga and anime adaptations.