Mimizuku to Yoru no Ou

, is a Japanese light novel series written by Izuki Kogyoku, with illustrations by Hiroo Isono. The series began publication on February 10, 2007 by ASCII Media Works under their Dengeki Bunko publishing imprint.

The series won the Grand Prize in the 13th Dengeki Novel Prize.

Synopsis
A girl visits the monster-infested night forest. A branding iron of "332" on her forehead, a chain that cannot be removed from her hands and feet, and a girl who calls herself Mizuku, presents herself to the beautiful demon king. There is only one wish for her. "Can you eat me?" Mizuku, who wants to die, and the King of the Night, who hates humans. The beginning of everything was a beautiful moonlit night. -It's a story of the collapse and rebirth of a little girl that begins at the end of despair.