A mysterious french pirate captain, Ruby Heart prefers heroic actions and generally sides with the "good guys" in contrast to many others in her profession. Ruby sails with her crew in a large flying ship that is specifically designed to aid her in combat as well. Outside her ship Ruby is an experienced hand-to-hand fighter, but often employs weapons such as her signature anchor and sabres, or tricks like a haunted chest with a hostile ghost within.
When something begins to kill off life on Earth, Ruby Heart and her crew begin to investigate it- linking the destruction with the evil Abyss, the ancient Armor of Erosion. Unable to defeat Abyss alone, Heart assembles all the strongest heroes from the Marvel Universe, such as Spider-Man, Wolverine and Captain America, and from the Capcom Universe, such as Ryu, Mega-Man and Jill Valentine. The assembled army of heroes track down Abyss and discover its power source- a black sphere in its center. After Abyss' defeat at the hands of the heroes, the sphere was cracked and drained of power. Once hoping to sell it for a profit, Ruby stared into the destroyed orb. Dismayed at its current worthlessness, she casts it into the sea.