protip: if a new character being introduced makes you genuinely mad, you should consider learning about emotional maturity, or just read some slop that doesn't have conflict so you can self-insert better. I suggest reading some utter trash like 100 Girlfriends That Really Love You, a light novel adaptation with thirty words in the title, or some incel revenge isekai like Redo of Healer instead of whining about this one, which actually has solid writing and interactions between the characters.
I'm betting this girl is the one who left positive feedback about Uehara's manga in Shonen Maximum. Also betting she's somewhat interested in Miyamoto, though it's possible she only knows or cares from reading her manga and recognizing the name. Guess we'll find out!
Also goddamnit Miyamoto, you were at the endzone and you fumbled again, and nobody even deployed fireworks or a passing train for the mishear.
Thanks for the chapter, bro.