Kaidan Nikki

Kyouichi comes from a family of exorcists, with his older sister being a skilled practitioner who compiled a notebook detailing methods to deal with various supernatural beings. Alongside his school's Occult Club, Kyouichi investigates a supposedly cursed shrine, where he requires his sister's rescue. Afterward, she disappears, with many believing her dead, leaving him only the notebook. Kyouichi continues in the Occult Club, dedicating himself to finding his sister as he grows older. His search gains new momentum when a shinigami, claiming to have been his sister's friend, appears.