In the unique world of Yietta, where colonists thrive on the planet's special liquid-gas oceans, Plastic Little kicks off as the Yietans are on the brink of settling their debts with the Galactic Federation. However, not everyone is keen on letting Yietta escape their grasp. Meet Tita, the 17-year-old captain of the Cha Cha Maru. Alongside her crew, Tita's expertise lies in collecting Yietta's exotic creatures for space pet stores. Yet, a twist of fate lands her in the middle of a dark scheme to seize control of Yietta. When Tita saves Elysse, a 16-year-old from military capture, she jeopardizes her crew's safety. But Tita is determined to see things through. As the conspirators rally to recover Elysse, rumored to hold a crucial computer code, Tita engages in a risky game of cat and mouse with a deadly army of assassins. This high-stakes chase unfolds on a planetary scale, where Tita isn't playing as the typical mouse – she's armed and ready to fight back!