The human body contains an astonishing 37 trillion cells. Among these are red blood cells that transport oxygen, white blood cells that combat bacteria, and countless other cells that tirelessly work day and night to maintain our health and vitality. High school student Nihu Chisaki, portrayed by Mana Ashida, lives a close-knit life with her father, Amou, played by Sadao Abe. Nihu is disciplined and consistently adheres to a healthy lifestyle, which keeps her cells functioning optimally. In contrast, Amou leads an irregular life and is indifferent to health, creating a discordant environment within his body where cells often express their grievances. Despite their familial bond, the internal environments of the father and daughter are starkly different. This harmonious duo shares a lively internal world, yet pathogens lurking within them are beginning to stir. A monumental battle for the future of the Chisaki family is about to unfold within their bodies!