Her backstory doesn't matter. Why can't these authors just respect the fact that someone said no.
Hell, even if she really did want to join but was too nervous to join, give her actual choice some power.
And frankly, even as a joke, don't let those characters to that sh*t.
It was probably funny the first 50 million times... but why still do it??? Maybe we wouldn't be as bothered if this trope wasn't as over done as it was... but the problem is that it's over done and just ignores the basic respect of a person saying no to something.
And I get that the girl probably isn't a bad person and a huge part of her personality is a comic exaggeration. I 100% get that.... but it's still annoying.... some jokes aren't funny when over done. I get that it's an anime/manga staple and a part of anime/manga culture... but please
Please for the love of all that is hentai, do not let our girl join the band... don't.... and don't over drag this either... please... for the love of all boobs, don't....