The great battle ended in peace, but the roots of the Four Trees are now soaked in blood: almost everyone in the valley lost relatives and friends in the fierce battle. Sorrow and fear settled in the hearts of cats. They swore to their stellar ancestors to live in peace, but it is not so easy to fulfill this promise. Gray Wing, broken by illness and death, Turtle Tail, cedes power to Thunder, and Clear Sky is expelled from the camp by a ruthless invader who came from the wastelands. To top off all the disasters, a mysterious disease appears out of nowhere, claiming the lives of those who survived the battle. To survive and win, the cats must find a mysterious Sparkling Star, but the path to solving it will not be easy. Betrayal, which has sunk its claws deep into the heart of the forest and wasteland, leads their inhabitants into a fatal trap...