Mariko Koike (1952~) was born in Tokyo. She made her debut with her essay collection Chiteki Akujo no Susume (Recommendations to Women of the World) that became a huge bestseller. In 1986, she published Dai 3 Suiyobi no Joji (Love Affair on the 3rd Wednesday) and since then she turned a novelist.

1989 Japan Mystery Writers'Association Prize, for Tsuma no Onnatomodachi (My Wife's Female Friend)

1996 Naoki Prize, for Koi (Love)

1998 Shimase Romance Literary Prize