Stand and fight for humanity. This arcade shooter takes place in the year 2022, as the Earth Defense Force fends off an all-out attack by unknown life forms. Become an EDF soldier, battle against endless hordes of immense enemies, and restore peace to the earth. Make way for the series‘ first humanoid aliens. Just what is this intelligent, extraterrestrial civilization that has attacked our own, known only as the Primers? Matching their intelligence, they bring the series‘ first humanoid alien foes. Battling against these intelligent foes will bring you to the depths of yet-unknown despair, and the heights of joy. Face the enemy with wisdom and courage!