Naoki Himura was the owner of a house where a Soul Eater was trapped. She accidentally set the monster free by scratching out a Celtic Monster Trapping Sigil hidden behind the wallpaper, leading to her daughter being put in a coma. The next night, Naoki was attacked by the Soul Eater and her soul got trapped in its nest. Thankfully, Naoki and Kat were freed when the brothers killed the Soul Eater, restoring their souls to their bodies and waking them up. Afterwards, Naoki reunited with her wife and daughter, and decided to sell the house.