The young girl Rei opened her eyes, and before her was a world she had never before seen. As Rei struggled to make sense of this strange land where the souls of the dead drift, she came across her little sister Mirai, who also stumbled into this world.
Rei took the hand of the frightened Mirai and tried to find a way back to reality, but was separated from her when the ground suddenly collapsed. Rei, who developed unusual powers, traveled the new land in search of Mirai.
But when she found her, a woman who calls herself Anamnesis appears.
Rei discovered that she is the one who brought herself and her sister to this world, and fought Anamnesis in an attempt to return to reality. However, her powers had only just developed, and her power of reason began to slip away as she lost control. As if to ridicule Rei, Anamnesis departs.
Worried about her sister’s disturbed state, Mirai extended a hand to Rei. “It’s alright now. Oh, I wish we could hold hands again, big sister.”
The out of control Rei tried to take Mirai’s hand, but with that hand she unwittingly killed her.
Unable to believe she killed her own sister, a devil appeared before the confused Rei and proclaimed: when the dead Mirai’s spirit reaches the deepest realm of limbo, Mirai will disappear. If Rei acts as a proxy for the devil and does as he asks, she may be able to revive Mirai before it is too late.
Rei hears the devil’s words, and decides she will do anything to save Mirai. Then, the young girl falls to her harsh fate…
