Kagirohi: Shaku Kei - Another (2017)

In an old school building in the countryside Kirishima Kaede is found dead. Her childhood friend Takahashi Aoi does not belives that she did commit suicide, but that she was murdered. One day, when Aoi is pondering his thoughts alone in a classroom, the mysterious transfer student, Minazuki Ajisai, calls out to him...