DARLING in the FRANXX - S01

In the distant future, humanity has been pushed to the brink of extinction by giant beasts called Klaxosaurs, forcing the remaining humans to take shelter in huge fortress cities known as Plantations. The children raised there are trained to pilot giant mechas called FranXX, the only weapons known to work against the Klaxosaurs, in boy-girl pairs. Bred solely to pilot these machines, these children know nothing of the outside world and can only prove their existence by defending their race. Hiro, an aspiring FranXX pilot, has lost his motivation and self-confidence after failing an aptitude test. Skipping his class' graduation ceremony, Hiro retreats to a forest lake, where he meets a mysterious girl with two horns growing from her head. She introduces herself by her codename Zero Two, which is known to belong to an infamous FranXX pilot called the "Partner Killer." Before Hiro can process the encounter, the Plantation is shaken by a sudden Klaxosaur attack. Zero Two engages the creature in her FranXX, but it is badly damaged in the fight and crashes near Hiro. Finding her partner dead, Zero Two invites Hiro to pilot the mecha with her, and the duo easily defeats the Klaxosaur in the battle that follows. With a new partner at his side, Hiro has been given a chance at redemption for his past failures, but at what cost?