from what i can tell this series is going to end like that game ending of school days.
this one.
“To My Children” (「我が子へ」, Wagako e?)
In the middle of a scene between Kotonoha and Makoto, he tries to comfort her that she is the only one for him, and that Sekai is good for nothing, and that she’s only there for him to sleep with. Sekai overhears this and becomes enraged. Six months later, Kotonoha and Makoto are on a walk outside, with her talking about having a baby. When they part, Sekai (now 6 months pregnant) appears and stabs Makoto. Even with a knife sticking into him, Makoto speaks calmly. Sekai suddenly becomes terrified at what she has done and runs off. Makoto slowly crawls to a bench, leaving a trail of blood. Makoto later dies.