Plastic Little takes place on Yietta, a planet where colonists harvest unique liquid-gas oceans to sustain their economy. The Galactic Federation is set to forgive Yietta's debt, but a group resists this outcome. Tita, captain of the Cha Cha Maru, is caught in the middle of a plot to take over Yietta after she rescues 16-year-old Elysse, a girl with a key computer code, from the military.