A half-demon with white hair and golden eyes had once fallen in love with a human priest. Both betrayed by each other, they sought to kill one another. The half-demon was running off with the Shikon jewel, the priestess had shot him in the heart with an arrow. 50 years passed since then.

You come from the modern era, and on your way to school, you fell down a bridge and landed in the feudal era. While stumbling around, you meet the half-demon girl who’s pinned to a tree.