So the FL deliberately sabotages her crush and spreads rumours in an effort to corner him and force him to break down mentally, eventually then pushing herself on him and making him see her as a salvation and become dependent on her. Cool. Interesting. But then she randomly mu*ders a teacher who talked smack about his parents (I thought she wanted others to torment him?), and decides to try and pin the mu*der on ML even though she was perfectly capable of covering up her crimes otherwise. And the detectives obviously sus out ML was not the mu*derer. So she basically just ruined things for herself.

And then her friends get suspicious and then there's the whole eventually finding out she's the killer by the detectives and friends, they just need to catch her in the act/get solid evidence, yadda yadda you know the works. So their class go on a school trip and the FL just decides to randomly start mu*dering a bunch of the other students, causing the others to go into a panic and eventually start a killing spree (wow, I guess....). Meanwhile she tries to run away with ML but her friends eventually confront her with the truth: apparently she got away with crimes because her dad is a police officer and he did it out of guilt towards her (honestly this part was so randomly coincidental I don't even wanna talk about her parents), and then turns out she's got DID (*sigh* lets criminalise the mentally ill) which is why she's so wishy-washy between protecting/harming ML.

ML tries to talk to her, but she thinks ML has rejected her so she basically gives up on life and burns herself along with all the dead bodies in the resort/cabin (guess everyone killed each other?). And then her dad also deletes himself, and everyone just kinda moves on. Then there's just one chapter after this finale where after 3 years ML talks to her grave and thanks her that the stuff she did helped get his emotions back or something and that's it.