Tokyo Ghoul

A female student in a school uniform stands in a dark, industrial space as glowing pink tentacles swirl around her; the scene cuts to a close-up of a masked man with red eyes, then to another student with blue hair, before showing the girl being flung through the air by the tentacles, followed by a blur of motion as she swings a weapon, and finally a shot of her running down a corridor with the tentacles pursuing her.