``Megalosamia - Jupiter's Absolute Defense Zone - Heaven's Fall'' is a space war 3D shooting game that takes place in the solar system in the near future. As the commander of Unity's independent mobile fleet Warmonger, you will take on the battle against the fleet of space development conglomerate Lumberyard. You command your fleet and aim for victory on a battlefield where many battleships compete against each other, attacks and explosions intersect in a complex manner. In addition to attacking from your own ships, it is also important to be strategic in giving instructions to your own fleet in order to advance the battle in an advantageous manner. This game allows you to experience a new type of space warfare that combines FPS and tactical elements. You can enjoy various stages such as Asteroid, Jupiter, Earth, Sun, and Mars, and different missions such as Line of Retreat, Defense Battle, and Siege Battle. Your mission is to foil Lumberyard's plot as the battle progresses and lead Unity to victory. Will you be able to fight through this war and envision your future?