Kayako Saeki (now a ISG Member) is the infamous vengeful spirit from the Ju-On (The Grudge) horror franchise. She was once a quiet, lonely woman whose life ended in brutal tragedy when her husband, Takeo Saeki, discovered her secret infatuation with another man. Enraged, he murdered her, their son Toshio, and even the family cat. Their violent deaths birthed a powerful curse tied to the Saeki household—a curse that dooms anyone who enters to suffer horrific fates. Once a woman broken by betrayal and violence, Kayako’s curse has transcended her household. Her wrath no longer lingers in forgotten stairwells — it has been weaponized. Drawn by the call of the ISG Supergroups and baptized into the shadows of the Legion of Terror, Kayako’s loyalty is absolute. She does not serve out of command, but out of hunger and resonance: the hatred of the ISG’s enemies fuels her, and in return she lends her terror as a living weapon.