A young woman, by some strange occurrence, was left to die alone in the former building of Seikyou Academy. Mysteriously, there is one person who can see her in ghost form: Niiya Teiichi, a freshman. Now they both seek to find out the reasoning behind her death, and what could have caused it.

(Source: DBR Scanlations)

Note: Other volumes can be found here: 
https://www.piratebays.to/torrent/9229704/Tasogare_Otome_x_Amnesia_-_Vol._01_-_10