 If you liked
Highschool of the Dead: Drifters of the Dead
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 ...then you might like
Higurashi no Naku Koro ni Kira
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To me both "High School of the Dead: Drifters of the Dead" and "Higurashi No Naku Koro Ni Kira" are a bunch of what if's to the whole story far from their original intention. Higurashi No Naku Koro Ni Kira, however is a type of OVA w/ multiple short stories, while HOTD Drifters of the Dead only focuses on one story. One similarity between the two is the use of fan service, however HOTD Drifters of the Dead does obviously contain a much more mature type of this fan service.