Leon is reincarnated in the world of the "otome game" he was playing as the third son of an impoverished baron. While he's trying to find happiness as a "mob" or background character, he's offered a terrible marriage proposal.
Because we're not her kids?
لأنّنا لسنا أطفالها؟
Weil wir nicht ihre leiblichen Kinder sind?
¿Porque no somos sus hijos?
¿Porque no somos sus hijos?
Parce qu’on est pas ses enfants ?
Perché non siamo figli suoi?
Porque não somos filhos dela?
Из-за того, что мы 
не её собственные дети?