Later she published various SF works and became the 10th president of the Science Fiction and Fantasy Writers of Japan.
Ōhara won the 6th Hayakawa SF Contest for her short story "Hitori de Aruite itta Neko (A Cat who Walked along Alone)" in 1980.
Then, in 1995 she won the 15th Nihon SF Taisho Award for "Sensō-wo Enjita Kamigamitachi, Gods who Bandied War" (戦争を演じた神々たち).
[3] She was a science fiction reviewer for Asahi Shimbun from April 1998 to March 2002, and she was on the jury for the Nihon SF Taisho Awards from 1997 to 1999.
Mariko Ōhara did the scenario for Quintet's video game Illusion of Gaia, along with Masaya Hashimoto and Tomoyoshi Miyazaki.