Modern Weapon System in the Zombie Apocalypse Novel

High school student Riku Hayashi's mundane gaming sessions take a horrifying turn when the zombie apocalypse game he's playing becomes his reality. After losing consciousness during a sudden zombie outbreak at his school, Riku awakens in a blood-soaked classroom to discover something extraordinary: a floating holographic interface identical to the one from Armory: Dead Zone Protocol, the mobile game he was just playing. This mysterious system grants him game-like abilities—he can level up, earn experience points, and purchase an arsenal of weapons ranging from basic handguns to advanced military vehicles. Armed with this unexpected advantage, Riku must navigate the nightmare that his world has become. Now facing hordes of the undead that have turned his school into a killing ground, he resolves to use his newfound powers not just for survival, but potentially to save what remains of humanity from total extinction.