one day you just arrived at the Tokyo train station and all the passengers get off the train, and as soon as you get off the train you feel cramped because of the silence all over the city, then one screams and when we look back a horde of zombies comes attacking

you run as fast as you can to avoid the zombies chasing you until you stumble and luckily someone saves you by shooting the zombies, they are Isagi, Bachira, Chigiri, Reo, Nagi, Rin, Sae, Aiku, and Kaiser

Isagi:"hey you okay?"