Kagura Gensoutan ~Ayakashi no Hime~

In the Showa era, Seiichirou trains various young boys and girls within a facility hidden deep within the forest on how to defeat youkai. One day, the director Sakura-hime instructs him to choose candidates from among the mikos to become the ‘omamori-sama’. Two girls were chosen – which of them will be selected as the ‘omamori-sama’? What is this role actually?