Your grandfather, who has depended on each other since childhood, was hospitalized because of an accident, and is at stake. When grandpa was seriously ill and lay in bed, he held an old photo and muttered that the hairpin was missing. The photo is a photo of grandfather with a woman when he was young, and there is an address behind it. You follow the address to this old house that has been abandoned for many years to fulfill your grandfather's wish. However, the old house that should have been dilapidated has traces of long-term living. A mysterious woman suddenly appears and sees you as intruders. As you explore more and more deeply, you find that things are far more simple than you think. There seems to be other "things" besides you in the empty old house. Here is a secret, about the old house, about a past, about your grandfather, and about you.