 If you liked
Higurashi no Naku Koro ni: Onikakushi-hen
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 ...then you might like
Utsuro no Hako to Zero no Maria
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Both are mystery (as well as many other genres) stories involving characters that travel across multiple timelines of similar situations. They involve seemingly normal groups of students, and the main female protagonists are "interesting" to say the least. Both use some comic relief, but are more centered on drama for the most part. They also have some supernatural aspects to the stories (though Higurashi's is to a much lesser extent especially early on). They are very psychological and delve deep into the minds of the main protagonists (Keiichi in Higurashi and Hoshino in HakoMari).