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Song Yunxiang, the last Star Soul General of the Human Race, brought the system back to the campus era. As a teenager, he had been looked down upon because of his incomplete soul, and because he was weak he could only watch his relatives and friends die in front of him. In this new life, reborn with a system and armed with 60 years of combat experience, knowledge, and technology, he returned to school. From then on, he built mechas to fight monsters... The things he regretted, the people he missed, this time he will not leave any regrets. (Source: Tencent, translated)

Side story booklets included with volumes 3 and 8 of the limited edition Blu-Ray/DVD release.

A collection of stories revolving around the characters of Front Mission Series: Gun Hazard.

After nuclear war broke out in the 1980s, a long nuclear winter descended on the Earth. Thirty years later, mankind has survived, but is engaged in an unending battle, even though the entire planet is in ruins. Arnold Gatse, the famous one-man army, is given a mission to defeat the enemy forever, by destroying the diglycidyl fortress at the heart of their base.

The crossovers of "Chou Denji Robo Combattler V", "Chou Denji Machine Voltes V", and "Toushou Daimos". The manga consist of 2 parts: Part 1: Jewelion, a murdered couple of Valerian and Boazanian's daughter tried her parent's revenge and destroy the peace treaties of Earth, Planet Campbel, Planet Boazan, Planet Baam. Combattler V, Voltes V, and Daimos fights against Jewelion's attack. Part 2: An evil Campbelian who is a model of android Great General Garuda came over with Daltanious in "Mirai Robo Daltanious" from the dimensional distance, and is going to do space conquest. it revealed mask man who chased Garuda was Prince Heinel, thought to be dead when saved his young brother, Kenichi's life.

Side stories that aren't included in the anime.

When a spacetime warp sends the Autobots and Decepticons to the Japan of another dimension, they get involved in Mazinger Z's fight against Dr. Hell and Baron Ashura. (Source: Village Books, translated)

C.E. 71: After the terrible battle of Yakin Due, an uneasy peace rests between the Earth Alliance and the Zaft Empire. But even as Cagalli and Athrun visit Chairman Durandal to cement the tentative cease-fire, Zaft terrorists plot with Neo Roanoke to drag both sides into all-out war. The plan: storm Zaft territory and steal several Gundam Mobile Suits. But that’s only the beginning. They’re also scheming to engineer a catastrophic event, one designed to drive the Earth down a bloody path. Now the crew of the Minerva must prevent disaster, as everything and everyone–including the love between Athrun and Cagalli–is thrown in mortal danger. (Source: Del Rey)

It is 35 years later from the battle of Brave Raideen and the Demon Empire, and battles of Combattler V, Voltes V, and Daimos. The peaceful city where the battle of super robots was forgotten was disturbed by two Gante, the giant stone demons which appeared suddenly. Akira Saezuri, an eighth-grader girl heard mysterious voice and became new pilot of Reideen. She revivies Akira Hibiki sealed for 35 years, and fights with Combattler V, Voltes V, and Daimos against; Mari Sakurano possessed by Barao, Prince Sharkin, Great General Garuda, Prince Heinel and Richter. However at the middle of a fight, Prince Sharkin find Akira Saezuri was daughter of his dearest younger brother.

In ancient Japan the Gowa family create a demonic Armor in order to defeat their enemies. Hundreds of years later this armor is exploited by the Gowa in the development of Tactical Armor for military usage and the usurpation of Japan.

Four years after the end of the One Year War between the Principality of Zeon and the Earth Federation, Cain Ragnard, a war orphan whose parents were killed by Zeon's attack on Side 7, has joined the Earth Federation Forces. For the vengeance of his parents, Cain joins the special force Shadows to hunt down the remnants of the Zeon menace. One day his team is sent to Earth to eliminate Zeon remnants in the Middle East, however, an act of betrayal changes everything... (Source: Gundam Wiki)

A manga adaptation of the game Mobile Suit Gundam Online.

A side story of The Big O which takes place between volumes five and six of the manga adaptation. (Source: Wikipedia)