Professional photographer Rei Kurosawa is on an assignment, taking photographs of an abandoned mansion when she sees her late fiancé, Yuu, and tries to follow him.
That night, Rei dreams of the Manor of Sleep. With the certain feeling that she can reunite with Yuu if she enters the manor, every night, Rei goes further and further into dream manor.
Now every time Rei falls asleep, she finds herself transported back to the "dream manor", haunted with ghosts. Her only defense is a device called the Camera Obscura, which can be used as a weapon to fight and capture phantom beings from the Other World.
Meanwhile, Miku Hinasaki, who lives with Rei and works as her assistant, finds herself pulled in her dreams back to the Himuro mansion where her brother Mafuyu disappeared, and a non-fiction writer/friend of Yuu Asou, Kei Amakura, becomes embroiled in the struggle against the dream manor when he researches for a way to help his niece Mio.
Can Rei put an end to the curse that's haunting her and others, or is she destined to become its next victim?
