In a distant cosmic realm, ancient energies are unleashed, as the forces of darkness and light intertwine, influencing the emotions of Earth's inhabitants. After overcoming negative emotions, Rainbow feels the call of the light energy. She discovers 12 star pets transformed from fragments of ancient light energy. With the assistance of these star pets, Rainbow, along with her friends Tali the Pegasus, Aurora the Hamster, and Nelly the Sheep, awakens her princess form capable of purifying negative energy, establishing the Rainbow Crew. However, despite their efforts to help residents overcome negative emotions, the power of grey energy not only persists but grows stronger. To completely eliminate the grey energy, they must uncover the person manipulating it.
Through the collective efforts of the Rainbow Crew and all Earth's inhabitants, the truth is about to surface. Shockingly, the manipulator behind the grey energy has been among the Rainbow Crew all along...