Masaaki Kuzumi, father of Hiroshi and Mana Kuzumi, moves his family to the mountain town of Jouga for professional reasons as an author. Writing for a book publishing company on fantasy and occult topics, he develops a deep fascination with Jouga's local folklore, particularly legends of giant wolves inhabiting the area. He considers these tales potentially rooted in historical truth while acknowledging such creatures could not realistically remain hidden today.

Actively researching the town's traditions—including the "Great God" lore and annual Hassaku Festival—he aims to incorporate these elements into his forthcoming book. His enthusiasm starkly contrasts with his children's disinterest, though they maintain a close familial bond. He openly supports his children's relationships, notably encouraging Hiroshi upon learning of a neighbor's affection.

Within Jouga, Masaaki finds an enthusiastic research partner in Hiroshi's neighbor, Issei Tsumuhana, and views Hiroshi's friend Kaname Asagiri as a genuine admirer of his work. He remains consistently portrayed as a supportive, if sometimes overly eager, parent and a dedicated investigator of the town's mysteries.