Majo no Iru Kyoushitsu

Overview

On the day she transferred in, Mari witnessed a boy fall from the school's roof! Was it suicide? But there are rumors circulating about a "witch's" curse, and creepy incidents are happening one after the other around her. Mari decides "If I don't kill her, I'll be killed", however... In addition to the title story, the 4 stories "Moebius no Yoru", "Mangetsu ga Miteita", "Kami no Te", and "Kurayami" are included. Step into the bizarre and fantastical world of Oohashi as she investigates the casual horror lurking in the everyday. (Source: Kodansha, translated)

Source: AniList