For 300 years, Aster, a black-cat familiar, devoted himself to the sun god Apollo, suppressing his nature to earn love that never came. When priestess Lydia frames Aster for destroying a sacred crown, an indifferent Apollo burns his paw and banishes him to the Underworld.
Instead of death, the Underworld's ruler, Hades, offers Aster grilled fish, a soft blanket, and unconditional freedom. Healing in this safe haven, Aster safely takes human form with his cat ears and tail intact, and shelter turns into genuine love.
When a remorseful Apollo tries to drag Aster back to Olympus, Hades storms the gods' council. The truth of Lydia's framing and Apollo's cruelty is exposed. Lydia is stripped of her priesthood for a thousand years, and Apollo is sentenced to care for abandoned animals.
Aster shatters his own collar and chooses to wander the mortal world by Hades' side, sealing their life together with a cup of pomegranate wine. Realizing love never demands self-abandonment, Aster finally finds an equal partner who cherishes him for who he is.
