38 titles Atashi no Naka no ... ["Inside Me ..."] (Tokyo: Kisō Tengai-sha, 1978 ) [binding unknown/]
Itsuka Neko ni Naru made ["Until the Day I Become a Cat"] (Tokyo: Shūeisha Cobalt, 1980 ) [binding unknown/Hirone Shii]
Shū ni Ichido no Shokuji o ["Meals Once a Week"] (Tokyo: Shūeisha Cobalt, 1980 ) [binding unknown/]
Hoshi e Iku Fune (Tokyo: Shūeisha Cobalt, 1981 ) [Ship to the Stars : binding unknown/]
Hitome Anata e ["To You, At a Glance"] (Tokyo: Shūeisha Cobalt, 1981 ) [binding unknown/]
Green Requiem (Tokyo: Kisō Tengai-sha, 1983 ) [Green Requiem : pb/]
Calendar Girl (Tokyo: Shūeisha, 1983 ) [binding unknown/Keiko Takemiya ]
... Zekku ["... Speechless"] (Tokyo: Hayakawa Shobō, 1983 ) [published in two volumes: binding unknown/]
Black Cat (Tokyo: Kisō Tengai-sha, 1984 ) [Black Cat : binding unknown/Eiko Ishizeki]
Green Requiem (Tokyo: Kōdansha English Library, 1984 ) [Japan-only trans of the above by Naomi Anderson: Green Requiem : pb/Kyōko Fumizuk]
A Ship to the Stars (Tokyo: Kōdansha English Library, 1984 ) [Japan-only trans of the above by Naomi Anderson: Ship to the Stars : pb/]
Labyrinth (Tokyo: Tokuma Shoten, 1984 ) [binding unknown/]
Tobira o Akete ["Please Open the Door"] (Tokyo: CBS Sony, 1984 ) [binding unknown/]
Hideo to Motoko no Ai no Kōkan Nikki ["Hideo and Motoko's Love Exchange Diary"] (Tokyo: Kadokawa Shoten, 1984 ) [published in four volumes: with Hideo Azuma: binding unknown/]
Anata ni Koko ni Ite Hoshii ["Wish You Were Here"] (Tokyo: Bunka Shuppan, 1984 ) [binding unknown/]
Knight Fork (Tokyo: Shūeisha, 1985 ) [Black Cat : binding unknown/Eiko Ishizeki]
Aishiteru kai SF ["Do You Love SF?"] (Tokyo: Shapio, 1985 ) [binding unknown/]
Neverland Party: Arai Motoko to Jugonin no Mangaka ["Neverland Party: Motoko Arai and 15 Manga Artists"] (Tokyo: Shinshokan, 1985 ) [binding unknown/]
Arai Motoko no Science Odyssey ["Motoko Arai's Science Odyssey"] (Tokyo: Shinshokan, 1985 ) [binding unknown/]
Kekkon Monogatari ["Wedding Story"] (Tokyo: Kadokawa Shoten, 1986 ) [published in three volumes: pb/]
Sakaurami Nemesis ["Mutually Hostile Nemesis"] (Tokyo: Shūeisha, 1986 ) [binding unknown/]
Shinkon Monogatari ["Honeymoon Story"] (Tokyo: Kadokawa Shoten, 1986 ) [published in three volumes: pb/]
Soshite, Hoshi e Iku Fune ["And Then ... A Ship to the Stars"] (Tokyo: Shūeisha Cobalt, 1987 ) [Ship to the Stars : binding unknown/]
Arai Motoko no Hatena Kyōshitsu ["Motoko Arai's Q+A Classroom"] (Tokyo: Tokuma Shoten, 1987 ) [nonfiction: binding unknown/]
Ima wa mō Inai Watashi e ["To The Me That Is No More"] (Tokyo: Tairiku, 1988 ) [anth: binding unknown/]
Midori Gensō: Green Requiem II (Tokyo: Kōdansha, 1990 ) [Green Requiem : pb/]
Black Cat (Tokyo: Kōdansha English Library, 1991 ) [Japan-only trans of the above by Kate McCandless: Black Cat : pb/]
Hoshi Kara Kita Fune ["A Ship From the Stars"] (Tokyo: Shūeisha, 1992 ) [published in three volumes: Ship to the Stars : binding unknown/Keiko Takemiya ]
Castling (Tokyo: Shūeisha, 1994 ) [published in 2 volumes: Black Cat : binding unknown/]
Tigris to Euphrates ["Tigris and Euphrates"] (Tokyo: Shūeisha, 1999 ) [binding unknown/]
Happy Birthday (Tokyo: Kadokawa Shoten, 2002 ) [binding unknown/]
Checkmate (Tokyo: Shūeisha, 2003 ) [published in 2 volumes: Black Cat : binding unknown/]
Shiki no Hanashi ["Tales of the Seasons"] (Tokyo: Booking, 2005 ) [chap: binding unknown/]
Chiisa na Ohanashi ["Little Stories"] (Tokyo: Shūeisha, 2007 ) [coll: binding unknown/]
Mo Ichido Anata to Aitai na ["Want to See You One More Time"] (Tokyo: Shūeisha, 2010 ) [binding unknown/]
In the Heaven (Tokyo: Shinchōsha, 2013 ) [binding unknown/]
Mirai e ... ["Towards the Future"] (Tokyo: Kadokawa Shoten, 2014 ) [binding unknown/]
Jinkō Chinō Miru Yume wa AI Short-Short Shū ["AI is the Man-Made Sentient Dream: Short-Short Collection"] (Tokyo: Bungei Shunjū, 2017 ) [coll: binding unknown/]