The story of Phantasy Star Online is unrelated to the original Phantasy Star series,[10] and is less substantial.[8] Threatened by the imminent destruction of their home planet, thousands of refugees arrive at planet Ragol aboard the spaceship Pioneer 2. As they establish contact with colonists sent ahead on Pioneer 1, an enormous explosion shakes the planet. Adventurers from Pioneer 2 land to investigate the explosion and search for Rico Tyrell, daughter of the head of Pioneer 2. They discover the planet overrun by monsters, and follow messages left by Rico leading to an ancient evil, Dark Falz.