Fata Morgana no Yakata: Anata no Genten ni Itaru Monogatari

You awaken in a decrepit old mansion.

A woman with eyes of jade stands before You, informing You that You are the Master of the house, and she Your Maid. However, You have no memories, no concept of self—or, indeed, any certainty that You are even alive. The Maid invites You to join her on a journey through the mansion's lifeless halls, to behold the numerous tragedies that have befallen its residents. She suggests that among them, perhaps You will find some trace of Yourself.

(Source: MangaGamer, edited)