Tasogare Otome x Amnesia

A first-year student named Teiichi discovers Yuuko, a ghost said to haunt Seikyou Private Academy, after accidentally bumping into her. Yuuko has no recollection of her past life and asks Teiichi for help. Together, they form a paranormal investigations club to uncover the academy's supernatural secrets. The manga is written by the author of "Tales of Wedding Rings."