A character from Getsuyoubi No Tawawa that parodies Yamamura Sadako from The Ring. Her name comes from Himura Kiseki's Twitter comments on the character.
Generally resembles Sadako, but with much bigger breasts and apparently far less obsession with killing people, as she ceases to show such tendencies from her second appearance onward in favor of developing a possessive quasi-cohabitative relationship with the boy she's currently haunting.
According to Getsuyoubi no Tawawa Sono VIII, she was a popular child actress but "couldn't get a decent role" and got bullied at school after growing up due to her breast size. She died from accidentally falling into a well because of her heavy breasts during the filming of a low-budget The Ring parody movie in 1998.
She collected many old game consoles and other electronic products from 1990s in the well like Super Famicom, Game Boy, Playstation 1, Tamagotchi and Cassette boombox.
She has Very Long Hair, Bangs that obscure her eyes, and wears a white Robe. And as noted above, like other female characters in the series, she has Large Breasts. Recently, the author has stated she's the largest of the current girls.