Shinju no Nectar

Shinju no Nectar (神呪のネクタール) is a manga series by Hiroyuki Yoshino with illustrations by Kenetsu Satou. It is serialized in Champion RED.

Plot
The Principality of Adal lies devastated in the wake of the Ord Army's overwhelming invasion. Princess Sakura, a surviving member of the nobility, flees to an abandoned temple and enacts a ritual to resurrect an evil warrior.