The smallest protagonist in film history – a human cell!

There are staggering 37 trillion cells in the human body.
Red blood cells that carry oxygen, white blood cells that fight bacteria, and countless other cells work tirelessly day and night to protect your health and life.

High school student Niko lives with her father, Shigeru.
Because of Niko's diligent nature and healthy lifestyle, the cells inside her body are always working joyfully. Meanwhile, inside Shigeru's body, the cells are always complaining, exhausted from the brutal working environment, as he leads an irregular and unhealthy life. On the outside, they may look like a happy father and daughter, but on the inside, their bodily environments couldn't be more different. As their lively days go on, pathogens start to sneak up on their bodies...

The most epic battle in the history of human cells, with the future of Niko and Shigeru at stake, is about to begin!