Tasokare, Kagerou.

Synopsis

On entering high school and looking at the class roster, Yuito Arisaka suffers a shock when he spots the name of the girl who used to bully him. However, the girl he sees there is someone else entirely, someone completely unrecognizable! A coming-of-age suspense story concerning "the girl whose existence evaporated." (Source: Shinchosha, translated)