Before the chaos

A virus caused massive chaos into entire AINA city
It'll rot a human and they'll turn into what they called zombies

Iori and Sougo are just normal university students when one of their schoolmates got infected and the virus spread out leaving the 2 of them as the only survivors and they met another stranger named yamato

luckily for them they met an army force unit named I.DOL and another strange man who introduced himself as riku who is a trainee researcher from a secret laboratory organization W. R. U

together they'll discover the truth behind all of this amd fight against the infected

how will they stop this chaos