A Japanese boy, Yusuke, and his classmates indulge in playing TV games. Accidentally, they meet the cute little robot, Tetra, who can speak human language and recognize Yusuke. It is Tetra that brings them the unprecedented challenges!

One day, the earth is targeted for massive attack by the transformed aliens. They kidnap Yusuke's little girlfriend, Misaki (Anne Suzuki) and her cousin Noriko (Sakai Miki). Tetra makes use of TV game to create the super Gangelion who joins with Yusuke and the computer expert, Kansaki (Katori Shingo), to fight the aliens using PlayStation 2!

In Juvenile, you get to see more than 300 cuts and composites of computer graphics. The spaceship, transformed aliens, and the super Gangelion are all well-designed and impressive. Juvenile brings you to the world of power and speed beyond your imagination!