Raid Martial Arts School

When the RR-type virus appears, it spreads uncontrollably across the world, infecting all life.

In the process, the 2 billion survivors have their bodies drastically improved, and their abilities, speed, cell activity, and skin flexibility increase hundreds of times.

On a virus-infected Earth, high school students around the world train the potential of the human body at dojos after class.

Na Ji-hoon stands at the center of the war against monsters that even possess intelligence.

Will Ji-hoon be able to save humanity and preserve the peace of the Earth?