She started writing in her thirties. Her first novel Confessions (告白, Kokuhaku) became a bestseller and won the Japanese Booksellers Award. The movie Confession directed by Tetsuya Nakashima was nominated to 2011 Academy Award.
She has been described in Japan as "the queen of iyamisu"(eww mystery), a subgenre of mystery fiction which deals with grisly episodes and the dark side of human nature.
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