To shatter the peace, the Dark Hei Kingdom Heldark suddenly invades Japan. As people's lives are threatened, the Earth Defense Force Japan Branch gathers five young individuals to form the Roaring Squadron Grand Five. However, Heldark's malice knows no end—its supreme leader summons the high-ranking general General Shade to devise a new plan. The plan: capture Grand Pink, the sole female member and central figure of Grand Five, brainwash her, and use her to destroy the team from within. A new battle erupts between these opposing forces.