My Lucky Pet Fairy

The Celestial Court's Koi Fairy, Kiki, is sent to the mortal realm to improve the luck of the unlucky Willow Lane. She transforms into a puppy and uses her immortal powers to reverse Willow's fortune. Kiki's focus on good luck triggers a luck backlash, endangering Willow. To save Willow, Kiki sacrifices her immortal essence. Promoted, she resides permanently in the mortal realm to protect Willow Lane. They start a new life together.