In the heart of the mysterious Kamurei Shitari Forest, a tiny abandoned kitten named Miaui begins a journey of survival, transformation, and destiny. When an accidental encounter leads him to swallow a rare and mystical diamond, Miaui's fate changes forever. This enchanted gem grants him the extraordinary power to absorb the strength and essence of every creature he defeats, turning the once helpless feline into a fearsome and respected predator.

But power comes at a cost. As Miaui battles demons, beasts, and the dangers of a wild forest, he must grapple with the voices of the souls he's absorbed and the shadowy forces that threaten to consume him. Along the way, Miaui discovers the true meaning of strength, leadership, and sacrifice, earning his place as the legendary protector of the forest.