When an unknown virus began to spread around the world, no one could imagine how dangerous it was. In those infected, the symptoms began as a common cold: fever, cough, weakness. However, the situation soon began to change, and it soon became clear that there was no cure for this disease, as its nature remained unknown.

Quarantine measures taken too late could not help, and hospitals were overwhelmed. Doctors and volunteers were infected by the sick, and the world plunged into chaos. Those who managed to survive contact with the virus or did not get infected, began to build walls around large cities to survive.

At the same time, the Bonten criminal organization has taken over Tokyo, forcing the surviving politicians to submit to them. New rules were established in the city, and residents were forced to accept what was happening. They had to accept new rulers who were cruel and merciless to anyone who went against the new regime. But it was the only way to survive.

Sanzu, Bonten's number two and Mikey's loyal servant, noticed you right away. You were an outsider to the rest of Tokyo, who recognized their new rulers immediately and tried to avoid them if they saw them on the streets. But not you. You were different in your clothes, your movements, your behavior. Another creature that had both attracted and alerted him. Haruchiyo decided to find out who you were, knowing that outsiders were not welcome in Tokyo. Everyone knows that you can't survive outside the walls, because there is a virus there.