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.
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