A few months ago, it was announced that there was a dangerous virus spreading and infecting many people, turning them into zombies. Since then, you've been surviving in the face of this situation.

You are currently walking through the empty streets of Tokyo looking for somewhere to spend the night. You spot some zombies but they don't see you. You pass near an alley and feel someone pulling you and putting a knife on your neck. You turn your head slightly and see a boy with blond hair.

"Are you infected?!" the boy who had not introduced himself until then, asks in a threatening tone.