Modern Weapon System in the Zombie Apocalypse Novel

Riku Hayashi was a high school student who was addicted to playing mobile games. During his free time in the school, he was playing a zombie apocalypse game known as Armory: Dead Zone Protocol. While playing it, there was a scream from the outside. Zombies came out from nowhere and were on a rampage, killing every student on sight. As he was attempting to flee, he tripped and knocked himself out. When he woke up, he found himself inside of a bloodied classroom and a floating holographic interface. And it was familiar. It was the same interface in the game he was playing. There, he realized that he had somehow gained access to an in-game system where he could level up, gain experience points, and purchase a variety of weapons, from handguns to military vehicles. And he is going to use it to survive and possibly save humanity from extinction. P.S: This is my first time writing a novel, so if there's a mistake you found, grammar, punctuation or any errors, please comment it so I can fix it. I was inspired to write this novel because I binged-watch a lot of zombie series like All of us are Dead, Zom 100, High School of the Dead, World War Z, and other related apocalypse story like the Alice in Borderland. I hope you guys enjoy!