One Piece Ep 442 - M2F Transformation

Episode 442 Ace's Convoy Starts - The Offense and Defense of the Lowest Level, Level 6!
As Luffy made his way to Level 6 with Inazuma and Emporio Ivankov, they were attacked by traps. As they survived the traps, Ivankov used his ability to gender swap a male guard into his true self. In appreciation, she showed the three prisoners the way to Ace's cage, only to find Jinbe and a pair of empty shackles in there.