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Takeo Saeki (in Japanese: 佐伯 剛雄 Saeki Takeo) is the true main antagonist in the Ju-on saga and its remake series The Grudge. He was an illustrator and the husband of Kayako Saeki. He is the main cause for the curse in the saga as he is the one who murdered Kayako and Toshio.
After Takeo discovers Kayako was in love with Toshio's teacher and he angrily murders Kayako when she came home, then he kills Toshio and his cat. He was eventually killed by Kayako's evil spirit. After this, he becomes an evil spirit as well, then he haunts the house along with his family, killing everyone who enters.
- Due to causing Kayako and Toshio's spirit trapped within Ju-On curse that turned them into vengeful spirits that come to kill those whom approach the house, Takeo is essentially the Bigger Bad of the series.