After accidentally running over a cat that was trapped in a bag in the middle of the road, Koichi is blackmailed by the cat's alleged owner, Tamami Kobayashi, who uses his Stand, The Lock, to place a shackle on him that grows heavier with guilt. When Okuyasu tries to get Kobayashi to drop Koichi's debt, he injures himself to make Okuyasu feel guilt, placing a shackle on him as well. Luckily, Josuke discovers the cat was a fake and heals Kobayashi's injury, removing the shackles from both Koichi and Okuyasu. Wanting payback, Kobayashi shows up at Koichi's house and manages to place shackles on his mother and sister. Koichi's anger towards Kobayashi causes his egg to hatch into the Stand Echoes. Although at first it seems that Echoes has little strength in its punches, it manages to imprint a sound effect on Kobayashi's body, causing him to constantly hear those sounds resonating through his body. Refusing to relinquish, Kobayashi stabs himself and implicates Koichi in order to increase the weight on his family's shackles and drive his mother to suicide. However, Koichi manages to use Echoes' ability to convince his mother to believe his innocence and remove both shackles, after which Kobayashi resigns himself to become Koichi's underling.