so another higurashi and school days..
No, not really, they have not much in common. But then again, Higurashi and School Days in one sentence is strange itself too, as Higurashi is a mystery murder story with a lot for forshadowing, while in School Days those moments are basically ony appearing in the bad endings as some kind of "WTF?!" unexpected comic relief.
Unless your whole connection between those stories is that they seem harmless in the beginning but can escalate into some real brutal stuff.