Kishin Corps

To save the Earth from alien invaders and their giant monsters, Dr. Kishida does what any other red-blooded mad scientist would do: he builds a giant robot - ARIEL - the ultimate feminine fighting robot! Unfortunately, his grand-daughters refuse to pilot it! Apparently, they've got more important things to do than becoming teenage super-heroes. Besides, how are you supposed to study for your college entrance exams while getting beaten-up in battle? Fortunately for Dr. Kishida, things aren't too well for the invaders, either. According to their reports, the Earth was the perfect target: lush, peaceful, and relatively defenseless. Theoretically, the planet should've surrendered long ago. Now, the war is at a standstill, the dreaded Accounting Department is warning about the serious cost overruns, and the head of the home office has arrived from Galactic Headquarters to personally oversee operations. Has Headquarters decided to unleash, The Audit - or do they have something even more evil in mind? The fate of the world rests upon two people: Aya Kishida, one of the doctor's granddaughters, who may have to give up prep school to pilot the mighty (and lovely) ARIEL; and a mysterious alien named Saber Starblast, who may have the power to defeat the invaders once and for all...

Prior to the events of the anime, three factions - the Garan Army, the Kiba Army, and the Aira Army, battle for total dominance of Machine Island. The island is basically a prison, isolated from the rest of the world. The island contains a vast amount of resources, allowing the three factions to create an infinite supply of giant robots for their respective armies. The world government learns that the island's power reactor has become unstable and will explode within 66 hours, destroying all of life and Earth itself. The government sends the Death Caprice squad, composed of mercenaries Ken Kaido and Ryo Magami to solve the issue, along with their giant robot Mazinkaiser, but was that a good idea?

10 years have passed since the end of the last war against the radam. A new team of Space Knights has been assembled under the lead of Aki and D-boy. The first mission of the new tekkaman is to defeat the radam but then, they have to fight against a remnent from the past.

10 years ago Dr. Shizuma and his colleagues invented the Shizuma drive which is a revolutionizing new form of renewable and recyclable energy. Though they had to pay a heavy price for their success in a catastrophic accident that the world only wants to forget about. However, all is not well as the secret organization Big Fire is hell-bent on taking over the world. They have obtained two of three mysterious Shizuma drive samples with an unknown function, which are an integral part of their world domination plans. The third sample has however been stolen by Dr. Shizuma who during his escape is saved by Daisaku, Giant Robo and the Experts of Justice. Then a desperate struggle begins between the Experts of Justice and Big Fire for the control of the last sample as Big Fire unleashes their mightiest weapon, the Eye of Volger, upon the unsuspecting world. Soon everything points towards the hidden truth behind the accident 10 years ago as the starting point of everything.