Two years after the last battle with Galaxia and Chaos, the Earth is still at peace. But the time of peace is quickly and violently cut short. A gate that separates Earth from a parallel realm of darkness and evil, a realm simply called the Dark Realm, is breached. The Sailor Scouts now face their toughest enemy ever. Will they survive and once again keep Earth from darkness and destruction? Or will they die, finally meeting their match, letting the Earth fall into darkness forever?