KokushiboxMizukiOC
One night, a young girl, hiding a dark secret, meets the Upper Moon One, and it just change her life forever...
(The reader is a female half demon from KPDH, daughter of a human woman and Gwi-ma.
ALSO: Koku may get a little bit yandere, but that's expected. But if you're not comfortable with yandere themes, then don't read this.)