DARLING in the FRANXX

The story takes place in a future where humanity has been pushed to the brink of extinction by giant creatures called Klaxosaurs, forcing people to live in fortified cities called Plantations. Children raised in these cities are trained to pilot giant mechs called FranXX in pairs, with boys and girls working together to fight the Klaxosaurs. Hiro, a young FranXX pilot, is struggling to find his motivation after failing a test and has become disillusioned with his purpose. He encounters Zero Two, a skilled FranXX pilot known as the "Partner Killer," who has two horns on her head and is rumored to be an infamous pilot.