When a human's time has come, it's up to the demons of the underworld to ferry the new soul to the afterlife. This noble duty with a proud history is carried out by every self-respecting demon... all except for Toko, the only demon in Hell who can't bring herself to ferry a soul and who is promptly booted into the overworld.
Now in the world of humans, Toko must reap a soul so that she can earn passage back home or face becoming a human herself. However, once she meets the cheerful Nadia, Toko's objectives change as she unravels the mysteries of the past and herself. But with bigger plans in motion behind the scenes, Toko's in for one Hell of a trip.