The human body is suddenly infected by a virus that turns immune cells against each other. Join Natural Killer Cell, Killer T Cell, Macrophage, and White Blood Cell, as they battle out a seemingly unstoppable enemy whose goal is nothing but the complete and utter destruction of their world.

The son of U-1146 and AE-3803 will have to face all the problems of being the first and only white-red blood hybrid cell of the body... and try to find what can motivate him to keep moving forward.