Tasogare Otome x Amnesia

Synopsis

Teiichi receives a letter referring to Yuko, which leads him to meet Kirie. She warns him that Yuko might be an evil spirit planning to spirit him away. As Kirie points out what is thought to be Yuko's true form, a walking corpse, she reveals that Yuko is her grandmother's late sister. Kirie tries to target Yuko's remains but is scared off by Yuko. Afterwards, Teiichi overcomes his fear and manages to reform Yuko in his desired image. He then joins Kirie in inspecting Yuko's corpse for clues of her past, finding a shrine near her corpse. Realizing the evil spirit is not Yuko but something else, Kirie decides to join the Paranormal Investigations Club to get to the bottom of the mystery.

(Source: Wikipedia)