Academic City of the Dead

In the gigantic academic city where all students are distinguished by rank, Ayamura Yuuji a high schooler who belong in the lowest rank of G. In his bid to speedrun into the top position in the world of online games, he underwent rigorous training, only ever talking to his sixth-grader little sister. One day, zombies appeared on the streets which spelled the coming of the end. The disaster struck during an offline meeting with his junior Minase Shiki, the girl who ranked second in online zombie survival games. In order to survive, the two shared their knowledge and joined forces so as to escape the city overrun with zombies— Source: LINE