The night before the Opening Festival, Rimuru throws a lavish banquet for all the nobles and royalty visiting Tempest. When the party is in full swing, Empress Elmesia of the Sorcerous Dynasty of Thalion arrives, throwing everyone into chaos.
I was a little worried 
since they took so long.
كنتُ قلقاً بعض الشّيء بما أنّهم تأخّروا
Visto il ritardo, mi ero un po' preoccupato.
Estavam demorando,
até fiquei preocupado.
Опоздали, правда, немножко…