Yami to Hikari no Sanctuary

Souji, heir to the Izumo family's ancient martial art for vanquishing vengeful spirits, serves as the bodyguard for his childhood friend Arisu, the daughter of a global zaibatsu leader. They journey to the remote island of Niizajima, where Arisu transfers to Kamikura Private Academy to find her missing older sister. The island is bound by strange 'rules,' concealing a dark secret. With the help of Arisu's friend Yuuri, rival heiress Claudette, and mysterious classmate Julie, they unravel the island's truth—only to face countless apparitions from legend. This tale blends superpowers, romance, and life-and-death drama.