Rengokuhime

is a Japanese light novel series written by Fujiwara Yu, with illustrations by kaya8. The series began publication on August 10, 2010 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
A different world [purgatory] located one level below this world. The atmosphere that fills it is harmful, but on the other hand, it has the property of interfering with the will of human beings and transforming into a universe.

Artemisia, the first princess of the country, had a peculiar constitution with a door leading to the [purgatory]. He is usually imprisoned in the castle dungeon as a cursed child because he always wears poison and kills all who approach him. But she occasionally goes out to the outside world. A warrior who received the secret order of the royal family ──

As a [purgatory] who controls the poisonousness of purgatory.