The flames of war explode in the Middle East as two shadow forces unleash monstrous new weapons of mass destruction! But in a world in which giant robots are real, the most dangerous weapon of all lies buried within a human mind. Yuushirou, the fourth son of the mysterious and powerful Gouwa family, finds himself at the center of events that will change the future of mankind forever! Nothing can prepare the human race for what is about to be unleashed in Gasaraki! (Source: Sunrise)

The Doron Empire from the Ganymede System discovered Earth as an ideal world for them to conquer. The interest of expanding the empire came as a result of the power-hungry General Ozmel who overthrew the current reigning Queen Medusa of the Ganymede System as a start of their universal conquest. Almost completely succumbed to the empire, Earth is at its last days, and one scientist, Dr. Shikishima, had only one hope in restoring Earth from its alien conquerors--- a massive mecha known as the Mechander Robo, specially programmed and designed to battle these invading aliens from complete takeover of Earth. Along with this awesome fighter machine, Dr. Shikishima also recruited three pilots to be placed behind the Mechander Robo's controls--- the mysterious Jimmy Orion, the scientist's son Ryosuke Shikishima, and Kojiro Hachijima. Although the primary storyline is Earth battling the Doron Empire, there is something within lead pilot Jimmy Orion's past that was somewhat connected towards the entire storyline.

After a decades-long war against the Dark Ones reaches a stalemate, the giant robot Atlanger is about to be formally retired. But when the Earth is suddenly attacked, it'll be up to Asuka Ken and a group of ragtag rookie pilots to save everyone. (Source: Inka-Subs)

Technology, science, and industry—this is 1969 Tokyo, and there is no better time to be alive! But a shadow looms quietly around every corner: Invaders have infiltrated the populace, and nobody knows who or what they are. Only the members of the top-secret agency AEGIS know of their existence. Covertly fighting the enemy is their job, but only those with the ability to open Gates to another world can truly defeat them. Within AEGIS is a specialized task force known as the Gate Keepers. Composed of extraordinary individuals with a variety of Gate-related abilities, they are the only ones who can save humanity from the vicious Invaders plaguing the planet. Shun Ukiya is an average high school student who lives with his widowed mother and little sister. While on his way home from school one day, he comes across a group of Invaders heading toward his house. In a desperate plight to save his family, Shun discovers he possesses the ability to open a Gate, allowing him to harness massive amounts of energy. With his newfound ability exposed, he catches the attention of AEGIS, and particularly the interest of one of its Gate Keepers, Shun's childhood friend Ruriko Ikusawa.