'An invitation?' Ciel who knew from the start that Madam Maya was also planning something could not help but be interested.
He took the invitation and read it. It probably couldn't be considered an invitation completely because it was full of words that were clearly written by hand, very beautiful and charming.
(His Highness the Prince, Son of the marvelous Ice Goddess. When I see you from afar, I know you will have a future that will thrill, no less than your great mother. I am Maya, a simple woman, would like to meet you, but as you know, it is not appropriate for me to come to Madam Zhou's territory given our poor relationship. If you wish, I hope you can come meet me at my Colosseum on Divine Cloud Road. In return, I will definitely give you whatever you want from me as long as it is within my means.)
With all those words, it can practically be considered a letter, a humbly written letter.