Within the confines of the inescapable Prison City, Chloe, a young girl left to fend for herself and her baby brother Rock, discovers a world where escape seems impossible. Raised amidst the city's grim reality and constant surveillance, Chloe's only solace is caring for Rock, never daring to venture beyond their home's walls. Yet, when she witnesses her neighbors' daring bid for freedom, Chloe embarks on a perilous journey with Rock in tow. Amidst chaos and separation, she is forced to leave him behind, clinging to the hope of their reunion. Over a decade later, honing her skills in combat, Chloe resolutely returns to the Prison City, driven by a vow to find her lost brother and fulfill the promise she made in her youth.