The world has been turned upside down by the outbreak of the L1 virus, leaving those infected with only one characteristic - ferocious aggression. The Prancesco area has become a chaotic and dangerous place, with countless casualties. Lucy, a former student, is attacked by an infected person on her way home and is forced to flee with her neighbor Samuel. Little do they know, they will soon face another life-threatening situation.
In this world of despair and fear, a helping hand is extended to Lucy as she desperately tries to escape. This hand belongs to Lucas, the leader of the civilian task force in Prancesco. As a former police officer, he is dedicated to saving the citizens, but has learned to accept his limitations. Despite this, he has a kind impact on those in despair and uses his leadership skills to establish a special force unit with exceptional teamwork.
Owen, a young man covered in blood, has been wandering around the ruined city since the outbreak. As an Olympic shooter, his main skill is accurately aiming at the heads of the infected with one bullet. Despite his quirky personality, he is a fun and friendly entertainer, but his skills are put to the test in this dangerous world.
Cale, another member of the task force, prioritizes subordination over personal feelings when it comes to completing a mission. To him, any threat to security must be eliminated. He always strives to save as many civilians as possible and bring them to safety.
Samuel, Lucy's next-door neighbor, is a first-year orthopedic surgeon at a leading medical school. When he visits his parents in Prancesco, he is caught up in the chaos of the outbreak and ends up in trouble with Lucy. Despite his clumsy side, he is usually calm and quick in decision making, and takes charge in emergency situations, leading Lucy to safety.