After losing her father in a car accident a year ago, 'Suha', a teenage girl, is not on good terms with her mother. Having become afraid of the dark since her father's passing, Suha resents her mother for making her spend the summer at a quiet village in Suha Valley. Suha's only source of comfort is her newfound friend, a puppy named 'Night'. With a black stone she finds one day, Suha somehow enters the Astro Garden, where the stars of the universe are taken care of at night. There, she meets Omu, the Astro Gardener. When Pluto's men attack and steal the dark, Suha loses the dark stone and Night's shadow. Omu warns that if they can't recover the stolen darkness overnight, the universe will vanish. Suha heads to Pluto's base with Omu to save Night from dying due to his missing shadow. However, encountering him on a pirate ship between two black holes, Pluto turns out to be the handsome, gentle young man of Suha's dreams!