Due to the depletion of Earths resources and the deterioration of the environment, more than half of the human population on Earth has migrated to Mars.
However, suddenly, invaders attack the Earth, and the remaining human population is forced to fight back.
Become Azusa Takanashi, an environmental researcher on Earth, and operate the state-of-the-art space fighter YK-IIA to wage the greatest all-out resistance in the history of mankind.
Defeat is never an option!

The eight action-packed stages are breathtakingly beautiful, and the gorgeous production brings the heated battles to life.
In addition, the BGM, created by game music legend Yuzo Koshiro, is a must-listen!
As you immerse yourself in the missions of Earthion, which has the theme of saving humanity, you will find yourself leaning forward.

- Arcade-style action across 8 stages, each with its own unique environment, enemies, and bosse
- Music and sound effects are all-new and created by Yuzo Koshiro
- Multiple difficulty settings and a challenge mode
- Scanline/screen display settings that can recreate a CRT-style display
- Password system that is easy to use even for those who are not good at shooting games
- Music Player Mode that lets you enjoy music within the game
- Includes a trial version that was playable at events