The Mystery Behind Soft Machine (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 four hundred fifty-eighth chapter of the JoJo's Bizarre Adventure manga. It is also the nineteenth chapter of Vento Aureo.
As Gang frantically searches for the missing Narancia, Mista suddenly disappears as well. When investigating how Mista vanished, Fugo disappears too. 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 him. Bucciarati asks Abbacchio to use his ability, but he refuses due to his mistrust of Giorno. In order to prove himself, Giorno willingly gets attacked by the enemy. Abbacchio can now reveal his Stand.