Once again, enter the Chambers area of the complex. This time do not enter the bedroom. Instead, board the lift to the right. As the lift begins carrying you upward shoot at the yellow glass and jump onto the walkway that is revealed. Walk the length of the ledge collecting ammo and armor.
Re-board the lift and ride it to the top and go through the door.
Press the small button on the post to the left. A final ladder is lowered. With Mikiko in tow, ascend the series of ladders to the top of the Hideout. Unfortunately, Mishima escaped your wrath once more. While you stand there contemplating where he was headed, Superfly shows up.