In a future devastated by climate catastrophe, two sisters, Cee and Kasey Mizuhara, find themselves torn apart by an unforgiving ocean. Cee, marooned for years with no memory of her past, clings to the belief that her sister Kay still exists beyond the sea. Determined to reunite, Cee's journey is fraught with hardship as she braves the elements to fulfill her yearning for family. Meanwhile, Kasey, a reclusive STEM prodigy, endures life in an eco-city designed as humanity's bastion against environmental collapse. When Cee's absence turns from weeks to months, Kasey grapples with the likelihood of her sister's demise, yet hope propels her to uncover Cee's mysterious departure. As Kasey delves deeper into the unknown, she confronts a web of secrets and a personal revelation that could shatter everything she knows.