Vento Aureo - Chapter 19 
The Mystery of Soft Machine, Part 1 (ソフト・マシーンの謎 その① Sofuto Mashīn no Nazo Sono 1), originally You! (おまえなら！ Omae Nara!) in the WSJ release, is the nineteenth chapter of Vento Aureo and the four hundred fifty-eighth chapter of the JoJo's Bizarre Adventure manga.
As Bucciarati's team frantically searches for the missing Narancia, Mista suddenly disappears as well. When investigating how Mista vanished, Fugo disappears too. Now convinced that their unseen enemy intends to pick them off one by one, Abbacchio worries over whether his friends are still alive, but Giorno assures him that they are fine.
By turning Narancia's shoe into a fly, Giorno is able to track Narancia's movement, and in turn that of the enemy. Bucciarati asks Abbacchio to use his ability to help find the enemy, but he refuses due to his mistrust of Giorno. In order to prove himself, Giorno allows the enemy's Stand to attack him. Determined to solve the mystery and save his teammates, Abbacchio reveals his own Stand.