While chasing a germ that thinks its cuteness will protect it, U-1146 meets Backward-Cap, a novice platelet who aims to become stronger. A sudden incident in the temple's area causes a breaking of capillaries, and the platelets must stop the internal hemorrage, with some coaxing from Megakaryocyte (cell that produces platelets). Megakaryocyte at first berates them for being weak, then motivates them by offering medals. The platelets form human chains to reach across the injury and seal it with a clot.