After dying in an accident, twelve year old girl Emily finds herself in a fantasy world. Clueless about the situation, she sets out to wander in the dark forest alone. A while later, Emily is chased by wolves, and eventually saved by a woman dressed in robes, carrying a Japanese sword on her waist. She is a bounty hunter named Susu, feared as the deadliest of her kind. Emily needs to stick to her, lest she may die (again). But even so, Emily and Susu run into trouble one after another. Outlaws and incorporeal predators are trying to kill them, and powerful beings unique to this parallel world awaken. Suddenly, the whole world is on the brink of destruction. In time, both Emily and Susu learn more about each other, and neither of them are what they appear to be. Emily begins to doubt herself. External memories come to her mind, and most of them make no sense. And finally, when things start going awry, Emily's true identity is revealed.