A cold love story (Yanderes are invincible. Didn't you know?)

The descriptions are very good and the general writing handles well the atmosphere, but the story is total nonsense: 

A guy shot seventeen times a coworker who kidnapped and impregnated his wife, this coworker was with the wife for about a year and then "on the run" for other two years but this guy finds him at "his place" (police didn't look in there) and in spite that seventeen shots are not self-defense he is not convicted for murder.

 The daughter of this rape story, Sarah, sees that her parents do not love her, so after hiding the corpse of a child Dad runs over with impunity, she decides to poison them both, and then saw their faces off, as any normal kid would do. 

School forces her to attend but somehow they don't realize that both her parents are dead, which is weird because she has lots of social problems which would be enough reason for a parent citation.

 One of the kids asks her name and out of that sole interaction she thinks "Well, clearly this person accepts me for who I am although he doesn't know who I am, otherwise why would he be asking for my name? And since this acceptance might change if he talks to other people then I'll have to murder them all, duh. Also, I've decided I love him (he doens't know it yet), and if he doesn't love me back I'll murder him as I did with my parents who are still rotting in the kitchen. Yes, that's what I'll do."

for people that don't know, this is how the face of madness looks like

 And somehow not only manages to kill both the MC's parents and the whole school bus despite being a feeble teenage girl, but also chops all the victim's limbs and hides them within the MC room. One in the giant crater in the roof, two more in the closet, two under the bed, and who knows where else.

 Like, she dragged the bodies from the bus in the middle of the road all the way down to MC's house on foot with a raging snowstorm. He never realized it, and when he finally does (like days or weeks after) he won't go to the cops, because that's for wusses I take it. Green beretas should start looking for rape childs! 5/10