Tomoka Kusanagi presides as chief priestess of Tenman Shrine in Kamaya City, succeeding her father, Seigen Kusanagi. She is the wife of Takuto Kusanagi and mother to Yuma Kusanagi. Her family owns the shrine and acts as landlords to their tenants, the Sumeragi family, later revealed as relatives. The Kusanagi clan boasts a long lineage of priests and priestesses skilled in exorcism, though the shrine now prioritizes attracting local tourism over performing exorcisms. Tomoka actively works to make the shrine more appealing, particularly to couples.

Personality-wise, Tomoka blends strength with flashes of childishness, displaying quick jealousy when her husband flirts with others despite knowing his deep love for her. She embodies the Yamato Nadeshiko ideal, maintaining a calm and traditionally feminine presence that contrasts with her husband's flamboyant style. She shares responsibilities overseeing the shrine's operations and legacy with her father-in-law, Seigen. Her established role remains consistent without significant development or expanded background across the series, films, OVAs, or other official media.