Another spoiler
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The Diva is actually doing a horrible job as a Diva. She completely live in her delulu bubble where the reality is that she's in the central of everyone's life. She does not care for the people. At all.
I haven't read chapter 17 but from the previous seems like the other songstresses under the Diva experienced having their carriage break and walk by foot or horse during a storm that lasted for days. The Diva and the appointed next high priest have no care of what these poor girls and knights suffered when they made their way to ML's country. The Diva is supposed to lead the other songstresses and are supposed to be a group. A team that works together. But the airhead Diva seems to think it's a soloist and her servants relationship instead. In fact the airhead seems to not even want to be with the other songstresses at all.
Also the next high priest is super sus. Idk I get a terrible gut feeling that he'll squeeze all of Arietty(MC) hard work and credit the airhead Diva of MC's work.
Spoilers
ML claims he has cancelled his engagement with the airhead attention enjoyer diva who spent most of her times at parties and entertaining multiple men flirting with her. ML also promised the heroine that he'll make her chose him.
A couple of chapters later, when the Diva arrives he does not kept his distances when she runs to him, hug him and stayed glued to his arm (literally). Ik it's stupid to apply real life common sense and real life aristocrats logic in a manga set in a fantasy world but, still even if the Diva must be respected etc, both of them are unmarried. That closeness is very diring to see.
Now that I think about it I guess this is why many songstress left the temple... they didn't like the Diva's complete disregard of social normal and well her reputation of endulging in luxuries, men and etc is ruining the Diva's role and consequencesly their role too since their her accompanists.
Anyways him endulging in the Diva's flirtiness and having her glue 24/7 to his arm in front of the woman (MC) he was supposed to win over is a very BRUH moment. How clueless can you be.