High on a misty mountainside, red panda cubs Popo and Ketu live happily with their mama. As the sisters grow, they promise that they will ALWAYS stay close to home. But while Popo is content to stay in the family's cosy treetop nest, bold Ketu dreams of excitement and exploration. And so when Ketu creeps off down the mountain in search of adventure, Popo must make a choice: will she keep her promise to Mama, or look after her sister? An epic tale about family, love and the power of keeping a promise.