When Motomi Utsuki moves in his grandfather's apartment, he meets a girl named Acony who claims to be a dead person. Eventually, he gets to know that this place and the people living in the building are not normal.
"I am, in fact, one of the dead."
So says Acony, a rather mischievous girl, upon her first meeting with protagonist Motomi. Newly moved into an ancient apartment, how will Motomi handle Acony and all the bizarre residents?