Dusk Maiden of Amnesia

黄昏乙女×アムネジア

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)