National Origin: While the distributors were often Japanese, the "Ni Na" in the title suggests a focus on specific performers or a specific regional school of acrobatics.

Are you trying to find from that era?

The "Secret Junior Acrobat" series is part of a specialized genre of performance media. These volumes generally focus on young athletes—often from Eastern Europe or East Asia—who demonstrate elite-level flexibility, strength, and coordination. Key Features of the Series:

Behind-the-Scenes Focus: Unlike televised competitions, these volumes often show the grueling practice sessions and raw talent of the athletes.