Heavy Weather (4) (ヘビー・ウェザー その④ Hebī Wezā Sono 4), originally Conventional (しきたり Shikitari) in the WSJ release, is the seven hundred twenty-second chapter of the JoJo's Bizarre Adventure manga. It is also the one hundred twenty-eighth chapter of Stone Ocean.
In a café, Perla Pucci was eyeing a good-looking delivery boy with her friends when a pickpocket suddenly stole Perla's handbag then tried to run away. The delivery boy intervened, throwing two cans through a window and knocking out the thief. It was how Perla and Wes Bluemarine met and engaged in a romantic relationship.
At the same time, Enrico Pucci had been pondering on his twin brother and what he should do, since he wanted to protect the privacy of the mother's confession. However, when Perla told Enrico about her relationship with Wes, Enrico soon discovered that Wes was his twin brother. Determined to end this incestuous relationship without hurting his dear sister, Enrico paid a private eye to break the couple. Unfortunately, said detective was part of a white supremacist oganisation which was against interracial couple. Believing wrongly that Wes was a mixed-blood due to the mother's past relationship, the detective and a mob beat Wes up in front of Perla, revealed that they already killed Wes' mother and burned her house down, then lynched him. Heartbroken, Perla threw herself down a cliff into a lake, not knowing that Wes still had a faint life in him.