Boogiepop and Others

This bizarre fantasy horror inspired by the anime series of the same name follows the story of a girls academy where the students have been disappearing, and a rumor is sweeping the school that a shinigami is killing the girls. But one determined student named Nagi Kirima has no fear of darkness or death, and she's prepared to trace the mysterious disappearances to the new deadly street drug that's coincidentally hit the streets around the same time as a creepy homeless man.