Cain heads to the royal capital with his family for a party celebrating his debut in noble society. On the way, they see a carriage being attacked by monsters, and Cain runs to help... and then learns that he's saved the princess and the duke's daughter.
So this is the royal palace!
!هذا هو القصر الملكيّ إذاً
Das ist der Königspalast!
¡Estoy en el palacio real!
¡Estoy en el palacio real!
Voilà donc le palais !
Quindi questo è il palazzo reale!
Então esse é o palácio real!
Это и есть королевский дворец!