Yoru No Nai Kuni
In the world of Yoru no Nai Kuni (Nights of Azure), a demon was defeated long ago and her blood scattered all over the world, turning everything it touched into demons. Now demons appear whenever it's night, causing a lot of unrest sleepless nights and that's why countries are now "nightless (yoru no nai)". Two girls Lilysse and a half-bred, Arnice were born in this age, working as hunters and exorcising the areas they could to restore peace. When Lilysse is chosen as the next sacrifice to seal the evil away, Arnice is determined to find a way to defeat the Night for good.
Yoru no Nai Kuni