Hataraku Saibou!!

The human body never stops working, and each day gives its cells something new to handle. Red blood cell AE3803 continues carrying oxygen through the tissues while white blood cell U-1146 hunts pathogens and protects others from threats their human host never sees. Life inside the body, however, is not simply a permanent war between good and bad organisms. Some bacteria are beneficial, mistakes are a natural part of cellular work, and even the most precise systems depend on cooperation when balance is disturbed. From allergic reactions and bacterial invasions to much larger crises that threaten the entire body, platelets, immune cells, and countless other workers intersect in one enormous network where survival depends on everyone doing the right job at the right time.