Naoko Sakurai (桜井直子, Sakurai Naoko) was a college freshman and the instigator of one of Yusuke's last shown cases as a "Spirit Detective". It eventually turned out that she had planned everything from the beginning. With the help of two girls from the basketball club, she made it seem as if her room was cursed. Kurama could tell that there was more than one perpetrator as the footprint appeared when the room was locked, and with more than one person they could quickly dispose of the evidence.