Higurashi no Naku Koro ni, Highschool of the Dead Recommendations
While Higurashi no naku koro ni is a lot more Mystery and about mysterious murders, both of them contain a lot of gore.
Both about students and making big changes, changing your attitude towards things. They both have similar artwork and are both quite gory, although HOTD is more gory.
They both are gory. Psychotic people are also included in both.
the both are gore and both got really good history