Hades Project Zeorymer, known in Japan as Project Zeorymer (冥王計画ゼオライマー, Purojekuto Zeoraimā), is a Japanese manga series by Yoshiki Takaya, written under the pen name Chimi Moriwo, and published in the adult manga magazine Lemon People from October 1983 to November 1984.

A four-episode OVA adaptation by AIC tones down the explicit sexual content and deviates entirely from the manga storyline and setting.

Nematoda's General Golshid, aware of the Himuro's appearance in Japan, send a G-Class robot to assault their base and kill them, as they believed they had the only "Joint".

Upon returning to base, Professor Himuro is shown to have collapsed and is dying of an incurable disease, and Masato realised the level of destruction fighting would cause, but strangely didn't care.

Suddenly teleported to Zeorymer's cockpit, it's revealed that Masaki is the revived, evil, Professor Wakatsuki, reduced to an embryo and reborn to escape an inevitable death, Miku was Himuro's wife, who had been cheating on her husband with him, had undergone the same process as she had been caught in the same event, and that Himuro was the one to attempt to kill them.

Defeated and nearly destroyed, Golshid is saved by the sudden loss of power of Zeorymer, as the Dimensional Joint had finally failed.

With both robots retreating, Wakatsuki installs a new Dimensional Joint into Miku, and upon her awakening, suddenly shifts back to Masaki for a moment.

Arriving at Nematoda's base, Zeorymer's landing destroys many of its defending machines with the resulting shockwave, and makes short work of the remainder.

Suddenly, the president of Nematoda appears, piloting a black Zeorymer, powered by the original Dimensional Fault installed into an "inhuman" Miku clone, revealing himself to be a second backup of Wakatsuki, but one with advanced aging thanks to the destruction left by the theft of the original Zeorymer affecting his regeneration.

Revealing that Zeorymer's power source was in another dimension, and that as a result, there can only be one Zeorymer, which was the reason that even Masaki couldn't make a perfect Dimensional Joint, despite having Wakatsuki's memories, the two machines merged into one, with the fake Miku collapsing, the original Dimensional Joint installing itself into Miku's womb, and Wakatsuki planning to take over Masaki's body in the process.

Eight Trigrams), but Masaki Kihara, the scientist behind the Hakkeshū, betrays the Tekkoryū and steals Zeorymer of the Heavens (天のゼオライマー, Ten no Zeoraimā), along with the embryo of the pilot genetically linked to the robot.

Fifteen years later, Yuratei ascends to the throne as Empress of Tekkoryū and orders the recovery or destruction of Zeorymer before proceeding with her plans to conquer the world.

Central Park Media licensed Hades Project Zeorymer in 1995 on LaserDisc through Image Entertainment[3] It was first released on DVD through NuTech Digital in 2001.