A deadly virus is turning the world's population into walking corpses. While the world erupts into chaos around them, Takashi Komuro and his friends frantically search for a way to break free from the living dead.

As the entire school quickly spirals into chaos, more players just into the fight, handmade weapons at the ready. New enemy traits are discovered, and the survivors realize the situation that they're really in.

The enemy's weak points are discovered and exploited. The human condition is put to the test, and everyone's base survival instincts kick in. Tensions rise as more people swell the ranks, and one survivor refuses to continue with the group

Z-Day +1...In times of crisis, even the most mundane activities become a monumental task. While on their way to the rendezvous, Rei and Komuro find that there's more to fear in this new world besides the walking dead.

The population grows desperate and chaos runs wild in the streets. Crossing any bridge presents a world of problems for Komuro and Rei, while dissension among the ranks splits the bus group in two.

With no help coming from headquarters, the police are ordered to use deadly force to maintain order at the blockade. Safe for the time being, the group relaxes and prepares themselves by gathering supplies for the chaos that awaits them outside.

Fully rested and armed to the teeth, the group looks on as people are eaten alive in the streets below, and learn a valuable lesson: you can't save them all. However, in the zombie apocalypse, there are always exceptions.

An animal is said to be the most dangerous when cornered. After crossing the river, the group takes a wrong turn and becomes trapped. With no help in sight and a wall of the living dead surrounding them, how many waves can they fight off before they're overwhelmed?

After narrowly escaping with their lives, Komuro and Saeko must make their way alone and rendezvous with the others. Saeko's true nature is revealed, and it begs the question: Is her beauty only skin deep?

The group reunites at Takagi's house, an impenetrable fortress run by her parents and their army of workers. After surviving this long on their own, being absorbed into a larger group becomes a huge concern.

Tempers flare in the House of Saya Takagi. Decisions must be made, and a leader must be chosen. Honor, love, devotion and mercy are put to the test; and a man from the group's past makes an unexpected return.