AA2153 goes to the kidneys to be bathed and finds that the Glomeruli are also overworked and stressed, but their leader, Gran, refuses to let them rest or complain, saying the kidneys are silent organs. The body gets a one-centimeter kidney stone, tearing the ureter and causing several blood cells to get lost in the urine. The body gets a tube inserted through the urethra that breaks the stone, but it also allows bacteria to invade. While the Neutrophils hold them off, AA2153 returns to the kidneys and urges them to evacuate, but Gran refuses to allow them...