Cosmo Sailor, a warrior from outer space, fights tirelessly to protect Earth's peace. However, her efforts are sabotaged by Koso Doro, two evil spies who secretly record her battles for profit, causing her to lose a crucial enemy. Though Cosmo saves them during a crisis, they betray her—shooting her with a modified stun gun while she's weakened, knocking her unconscious and forcibly imprisoning her. Their cameras capture everything. Worse, she's exposed to Emeralgnite, a special mineral that weakens her body and drastically reduces her combat abilities. Eventually, Cosmo is captured by ordinary civilians, her helpless form recorded on camera. Can she overcome this dire peril and save the people under attack? To protect Earth's lives, she must fight. Cosmo Sailor, the time to battle is now!