In the crowded, anonymous confines of the Tokyo subway, Yumihi's camera captures the illicit thrill of chikan, or groping, in action. A train packed with commuters provides the perfect cover as unseen hands grope and fondle unsuspecting Japanese women. The women, dressed in professional attire, squirm and shift uncomfortably, trying to dislodge the intrusive fingers, but the perverts persist, driven by their secret, shameful desires.