Bred for the sole purpose of piloting these machines, these children know nothing of the outside world and are only able to prove their existence by defending their race.
In the distant future, humanity has been driven to near-extinction by giant beasts known as Klaxosaurs, forcing the surviving humans to take refuge in massive fortress cities called Plantations. Children raised here are trained to pilot giant mechas known as FranXX—the only weapons known to be...
If you listen closely and try to zone out the voice saying Laurel, You can barely hear a silent voice say Yanny.
So, The correct answer to this is, Both. Cause if you listen closely you can hear both of them.