JoJo no Kimyou na Bouken Part 5: Ougon no Kaze

Synopsis

Abbacchio attempts to retrieve the key, but Illuso uses a nearby piece of a mirror to draw him into the mirror world. Abbacchio attempts to trick Illuso into taking Moody Blues into the mirror, but Illuso counterattacks, leaving half of Abbacchio and Moody Blues in each world, rendering each powerless. In desperation, Abbacchio cuts off his own hand, enabling Moody Blues' hand to grab and deliver the key to Giorno. However, rather than flee with the key, Giorno allows himself to be dragged into the mirror world by Illuso. Giorno reveals he had infected himself with Purple Haze's virus, and has now passed it on to Illuso. To save himself, Illuso escapes back into the real world, leaving his infected arm in the mirror world. However, Giorno had earlier used Gold Experience to turn a brick into a snake which tracks Illuso's position, enabling Fugo to follow and kill him with Purple Haze. As Illuso dies, Fugo, Abbacchio and Giorno return to the real world, where Giorno uses the snake's antibodies to cure his own infection before tasking Fugo with treating Abbacchio's wounds.

(Source: Wikipedia)