In the year 2010 AD, Hyper Hurricanes born concurrently all over the world caused severe damage. Five billion people lost their lives, decreasing the world's population to 3 billion. Existing economies and military were wiped out. Countries were frozen under solid ice, plains sank beneath seas, the world was changed dramatically. Human civilization enters a chaotic era. Poverty flourished outside of these economic zones and slums were widespread. The ruling class called themselves Logos and maintained their position by force of arms. They call the poor Revenus, who are exiled to live outside the special economic areas. Time has passed since then. Katsuragi Jo and Tsurasawa Jin, escape from Phantom, a force organized to watch Revenus and to suppress renegade elements of the Logos, taking with them a mysterious girl, Nobuto Sana. There are many who are interested in her, all with their own reasons.

In California's Center City, shy but kindhearted Joseph Carter "Joey" Jones lives with his grandmother, working in a coffee shop. Though his family is financially burdened and he is bullied at school, he remains cheerful. A robotics enthusiast, he wants a top-of-the-line toy robot called a Heybo more than anything. One day Joey and his friend Simon "Psy" Kaina come across a destroyed Heybo discarded by a group of rich kids. He takes it home and repairs it himself, excitedly naming it Heroman. However, one night Heroman is struck by lightning and comes to life, growing several times its size in the process. That same night Center City is attacked by aliens called Skrugg whose attention was brought to Earth after Joey's acquaintance Professor Matthew Denton made attempts to contact them. Along with Joey, Heroman quickly heads to the scene of the attack, where he finds people in trouble, including his friend Lina Davis and her father. Using an arm-mounted controller, Joey is able to command Heroman to use superpowers to fight off the Skrugg and rescue civilians. As the aliens continue their invasion of Earth, the duo are the only ones separating humanity and destruction. [Written by MAL Rewrite]

Second season. In the distant future, trains are no longer bound by their physical tracks. Instead, they take to the skies and travel across the universe on the Galaxy Railways, transporting mankind from planet to planet. However, the Galaxy Railways are no safer than traditional trains: criminals, terrorists, and vile aliens always find a way to stir up trouble. Manabu Yuuki, a rash and hot-headed man, is the latest addition to the Galaxy Railways' elite Space Defence Force (SDF). These brave men and women are responsible for protecting the railways and responding to any unprecedented danger, risking their lives to protect the innocent from evil. But as this drama unfolds and the SDF's greatest crisis draws nearer, Manabu must truly learn what it means to be a member of the SDF before it is too late. [Written by MAL Rewrite]

Ever since the 10th NOVA clash, the Chevalier had concluded that the NOVA have been appearing at a steadier rate and they are losing more Pandoras than they can produce. Their solution is the E-Pandora Project which involves normal humans being given the power to become Pandoras. Inviting Pandora from around the world to their Alaskan base witness the unveiling of their new project, Satellizer, Kazuya and Rana are among those who have been summoned. However, as time goes the E-Pandora Project starts to become fishier and the Pandoras start to grow more and more concerned...