Satoko Hōjō originates from Hinamizawa village, bearing significant childhood trauma. Born June 24, 1971, she used multiple surnames—Hatake, Yoshizawa, Matsūra, and Hōjō—due to her mother's frequent marriages. Distrusting her stepfathers and conflating their actions, she filed a false abuse report against Mr. Hōjō, self-inflicting injuries as evidence. During the Hinamizawa Dam Project, her parents' support made them village outcasts, subjecting Satoko and her older brother Satoshi to harassment.
Around the 1980 Watanagashi Festival, severe paranoia from undiagnosed Hinamizawa Syndrome convinced Satoko her parents intended to kill her at Shirakawa Park; she pushed them off a viewing platform, causing their deaths. An alternate account in the console-exclusive arc Mio