Grind Me Down

A dark-haired anime girl with purple eyes looks down, then lifts her head with a blush, her expression shifting to a smile as she touches her cheek. The scene changes to a red-haired girl with a wide, unsettling grin, then to a girl with a bloodied face and a knife on the floor, followed by a girl in a revealing outfit in a classroom, and finally to a group of four girls in school uniforms posing together.