As someone who's read what happens next in the novel, here's an extremely simplified version of what happens.
Rinko: "So are you some kind of tsundere for your oniichan? Well, guess what bitch. Do you know the term YANDERE???"
@bluefox_1 she's yandere enough that it's heavily implied
AND
AND
Rinko: "So are you some kind of tsundere for your oniichan? Well, guess what bitch. Do you know the term YANDERE???"
@bluefox_1 she's yandere enough that it's heavily implied
she's the author of the childhood friend books that keep destroying the MC's books in sales
she might have started writing for the SOLE purpose of outselling the MC (who she has figured out is that author) to prove that childhood friend > stepsister
she is now pissed off to the extent that her author persona starts publicly shitting on stepsibling themes
