Does this count as yandere?
>Overcome by emotion, Sekai stabs and kills Makoto the next day while at his apartment. After a few words from Makoto, Sekai becomes shocked by her actions and runs away in a panic. Shortly afterwards, Kotonoha arrives at Makoto's home to find him dead. Sekai, who was hiding in her room, receives a cryptic text from Makoto to meet "him" at the school's rooftop. She proceeds there cautiously, carrying the knife she killed Makoto with in her jacket. After arriving she is confronted by Kotonoha, who accuses Sekai of lying about being pregnant. Sekai denies lying, and Kotonoha tells Sekai to look inside the gym bag lying on the bench, which contains Makoto's severed head. At that moment, Kotonoha unravels a bloody dozuki and kills Sekai. In a state of insanity she cuts open the womb of Sekai’s lifeless body and upon seeing nothing, concludes that Sekai was lying.