Green Dolphin Street Jail (グリーン・ドルフィン・ストリート刑務所 Gurīn Dorufin Sutorīto Keimusho), originally Baseball Boy (ベースボール・ボーイ Bēsubōru Bōi) in the WSJ release, is the six hundred fourth chapter of the JoJo's Bizarre Adventure manga. It is also the tenth chapter of Stone Ocean.
Jolyne begins to understand the limitations of her ability. When unraveled into string, Stone Free can travel far, but is weak and easily damaged; when clumped up together, it forms a body with a range of two meters but much better strength.
At the prison phones, Jolyne waits to make her call. A prisoner asks her for a dollar to continue her call, which she obliges. When she tries to approach an empty phone, she's knocked back by another prisoner. She's told that the phones are reservation only, and that she will have to wait a month before using one. Gwess approaches her, seeking forgiveness, but Jolyne wants nothing to do with her. Gwess warns her about giving away money, and that even giving away just a dollar is enough to damage Jolyne's reputation.
In the prison library, Jolyne confronts the prisoner for her dollar, who erupts at her. After being asked for more money, Jolyne goes to the restroom. The prisoner begins having bad stomach pains, and rushes to the restroom. The prisoner offers to repay the dollar for the bathroom, but Jolyne refuses. The prisoner offers to pay her ten dollars, and Jolyne accepts. Jolyne gets the money and helps a timid prisoner get her money back as well. As she walks away, Jolyne spots a baseball roll by, as well as a boy in a Cubs uniform chasing after it. The boy warns her that someone will come to meet her tomorrow, and that she cannot go see him no matter what.