User blog comment:GamerTimeUS/Rescue Trial Arc = Villain Alliance Arc/@comment-25663193-20141214144543

The japanese version doesn't call it 'Villain Alliance Arc' but instead it said they were on the peak of the battle against the villain alliance ("VS敵連合" versus the villain alliance).

Besides, I personally call this arc "USJ arc" since everything happens there. But yeah, Rescue Trial Arc doesn't really seem right since the students haven't properly 'rescued' anyone.