Manga: JoJo's Bizarre Adventure: Shining Diamond's Demonic Heartbreak, Volume 1

Shining Diamond's Demonic Heartbreak is an official spin-off from the JoJo's Bizarre Adventure universe, set between Part 3: Stardust Crusaders and Part 4: Diamond is Unbreakable. The story follows Hall Horse, a former ally of Dio, who arrives in Japan on a secret mission... but he's not alone. He's joined by former prisoner Boing Boing Boy, and the two soon find themselves embroiled in a tangled plot involving a dangerous new Stand user and a mysterious connection to the Stardust Crusaders.