This indicates the fourth set of figures released in the official series. Each volume typically introduces a new cast of characters or updated acrobatic poses.
Secret Junior Acrobat Vol. 4 (New) is the turning point of the series. It sheds the "junior" label in spirit, presenting a mature, introspective look at the cost of greatness. For collectors, the 16L format makes this an essential shelf piece. For story lovers, it is the volume that proves this act is far from over.