|This is the article on the Anbu. For a member of the Hyūga clan, head to Kō Hyūga.|
|Novel||Itachi Shinden: Book of Dark Night|
Kō's younger sister died during the Nine-Tailed Demon Fox's Attack, which many believed to have been the doing of an Uchiha. For this reason, Kō was upset when Itachi Uchiha was added to Team Ro, concerned that Itachi might try to undermine the team's task of monitoring the Uchiha clan's movements. Kō's team leader, Kakashi Hatake, disapproved of how he treated Itachi.