Animesmerize

"School Days"
While having dinner with Kotonoha at a restaurant, Makoto receives a phone call from Sekai, who is waiting at his home. Before hanging up, he tells Sekai that she ruined his life by getting pregnant and announcing it to the class. Sekai texts him an apology and leaves for home, but not before she destroys the dinner she had planned to share with Makoto. On the train ride home, she catches sight of Kotonoha and Makoto together, which causes her to head back to Makoto's. After a tense confrontation with Kotonoha, Sekai leaves in a state of agony after witnessing Makoto and Kotonoha kissing deeply in front of her. As she is walking home, it is revealed in a flashback that Sekai knew all along of Setsuna's feelings towards Makoto, even to the point of supporting Setsuna to confess, and Sekai finally realizes what she’s done to Setsuna. The situation worsens overnight when Makoto suggests to Sekai over text that she have an abortion. Overcome by emotion, Sekai stabs and kills Makoto the next day while at his apartment; shocked and panicked by her actions, she then flees the scene, and Kotonoha arrives shortly afterwards to find Makoto dead. Hiding in her room, Sekai receives a cryptic text message from Makoto’s cell phone, telling her 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 her pregnancy. 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 wasn’t pregnant. Kotonoha then takes her family’s boat and drifts off into the ocean, and is last seen holding Makoto’s severed head in her arms, smiling and saying that they can finally be together. Time passes by and life at the school returns to normal.