This chick is crazy, but I feel like the author's purposefully making her meet the "Crazy social media girl" Stereotype, uncanny resemblance to the stereotype either way.
There are some nice references to underground japanese bands in this manga.
On page 3 you can see the guy listening to Supercar's YUMEGIWA LAST BOY and in a past chapter someone requested MC to cover Kinoko Teikoku's Chronostasis.
Other interesting thing: the author organizes some live events and has made a playlist to go with the manga: https://open.spotify.com/playlist/37i9dQZF1DXbWQVJhnKcQ4?si=EwEkGny6Q1G_sbV89N-nFw
Looks to me like a MacBook Pro she's holding aloft. The beloved of composers. As the previous comment noted, this manga's sprinkled with references to real life.