Press material describes Koutetsu Jeeg as "A simple tale of 'Good versus Evil' while at the same time [being] a robot anime created for the sake of the adult core audience."

The story takes place 50 years after the original and features a new cast of characters—primarily the new main character Kenji Kusanagi, a high school student and motorcycle racer who becomes Koutetsushin Jeeg to fight the sudden reappearance of "Haniwa Genjin" ("Haniwa Phantom Gods", or clay robots) from the Great Jama Kingdom ruled by Queen Himika.

Other characters include Tsubaki Tamashiro (granddaughter of Miwa Uzuki) and Kyo Misumi, Kenji's partners.

There, he grasps a giant sword, creating an energy vortex that surrounds the entire island.

While riding the motorcycle, Kenji can activate the Raikoba's transformation by slamming his fists together and yelling "Build Up!"

Kenji later learns that his own parents were part of the Jeeg project and his father designed Raikoba.

The Big Shooter is mainly piloted by Kyo who controls the jet's flight and on-board weapons.

Jeeg's armor is very durable and can take a lot of punishment before any signs of damage are shown.

Jeeg's Final Form after Hiroshi sacrificed his Bronze Bell to Kenji to save his life plus the power of Baruba.