Thanks for the TL!
Not a whole lot incest but I'm happy author-san managed to reshape the dream they had but kept its spirit. Because it's very obvious given the pacing that we'll never see Sera become a real idol.
The writing is trying to create a similarity between Sera and Kyapi, but Kyapi is largely more unlikable. While Sera regularly keeps getting dealt a bad hand and is unable to work her way out of it, Kyapi could never walk far enough to commit to anything before getting tired of it. Now that she'a vtuber, Kyapi'll get her love and adoration, but that will never compare to being adored by your little sister.
This is a lot like Monsters University with the lesson that you can't always be what you want to be. It's also very uneven in the writing which won't put it among the greats (or even the good enough), but it's just okay.