Title: Kazumasa Hirai (author)
Content:  Kazumasa Hirai (平井 和正) was a Japanese novelist and science fiction writer from Yokosuka, Kanagawa. He graduated from Yokosuka Industrial High School and the law department of Chuo University. Hirai is well known for his SF-manga work. He is the creator of 8 Man (aka 8th Man in the USA) and was well known as the story creator of the 1960s manga series "Genma Taisen" (Genma Wars) about a hero with psychokinetic powers and his battle against a space villain called Genma. Hirai wrote stories for the Wolf Guy comic series, and also published comics co-authored with cartoonist Shotaro Ishinomori that were later adapted into an animated film in 1983.
Title: Genma Wars
Content:  Genma Wars (幻魔大戦) is a Japanese science fiction manga and novel franchise that began in 1967. It was a collaboration in Weekly Shōnen Magazine by science fiction writer Kazumasa Hirai and manga artist Shotaro Ishinomori. It was adapted into a 1983 anime film, a 2002 anime television series, and a 1983 laserdisc video game called Bega's Battle in North America.
Title: Kazumasa Hirai (author)
Content:  ; Genma Wars (1979-1983) ; Armageddon (1987) ; Armageddon Girl（The Girl in Harmagedon (closet screenplay) ハルマゲドンの少女） (1986) ; Genma Wars deep (2005) ; Genma Wars deep Toltec (2008) ; Chikyuuju no Megami [地球樹の女神] ; Chikyuuju no Megami (1988-1992) ; Crystal Child (1997) ; Sono hi no gogo, Hôdaiyama de (2004) ; Bohemian Glass Street {9volumes} (1995) ; 21st Century 8 Man ; Infinity Blue (2002) ; Blue Series ; Blue Highways (2002) ; Blue Lady (2005) ; Abduction Series ; Jikuu bôsô kimagure Bus (2001) ; Wayward Bus (2003) ; Stray Sheep (2003) ; Abduction (2003) ; Silence (2003) ; Shade (2003) ; Capricious (2003) 
Title: Kazumasa Hirai (author)
Content: 8 Man (artist: Jiro Kuwata) ; Elite (artist: Jiro Kuwata) ; Chou ken Leap (artist: Jiro Kuwata) ; Genma Taisen (artist: Shotaro Ishinomori) ; Death Hunter (artist: Jiro Kuwata) ; Wolf Guy (artist: Hisashi Sakaguchi) ; Spider-Man: The Manga (artist: Ryoichi Ikegami) ; Shin Genma Taisen (artist: Shotaro Ishinomori) ; Crystal Child (artist: Ayumi Izumitani) ; Bachigami (artist: Yuuki Yogo) ; 8 Man Infinity (8 Man sequel: Kyôichi Nanatsuki, artist: Takayuki Takashi) 
Title: Tadashi Kawashima
Content:  Tadashi Kawashima (河島 正) (April 7, 1969 – June 15, 2010 ) was a Japanese manga artist and manga gensakusha from Ehime Prefecture. He is best known for writing the manga Alive -Saishū Shinkateki Shōnen-.
Title: Kazumasa Hirai (author)
Content:  (1975) ; Ougon no Shoujo {5volumes} (Golden Girl, 1985–1994) ; Inugami Akira {10volumes} (1994–1995) ; Gekkou Majutsudan Series [30 volumes] ; Gekkou Majutsudan {12volumes} (Moonlight Magic, 1996–1998) ; Wolf Guy DNA {12volumes} (1999–2000) ; Genma Taisen DNA {6volumes} (Genma Wars DNA, 2002) ; Wolf Guy Extra Volumes ; Wolfrando ~ Ookami no Sekai (Wolfland ~ The World of the Wolf, 1976) ; Megami Henshou (1988) ; Cyborg Blues (1971) ; Zombie Hunter [死霊狩り(ゾンビー・ハンター)] ; Zombie Hunter (1972) ; Zombie Hunter 2 (1976) ; Zombie Hunter 3 (1978) ; Akuryō no Joō (1976) ; Genma Wars Séries [幻魔大戦シリーズ] ; New Genma Wars (1978) ; Real Genma Wars 
Title: Hajime Isayama
Content:  Hajime Isayama (諫山 創) is a Japanese manga artist. His first series, Attack on Titan (2009–2021), became one of the best-selling manga series of all time with 100 million copies in circulation as of December 2019.
Title: Jun'ichirō Tanizaki
Content:  Jun'ichirō Tanizaki (谷崎 潤一郎) was a Japanese author who is considered to be one of the most prominent figures in modern Japanese literature. The tone and subject matter of his work ranges from shocking depictions of sexuality and destructive erotic obsessions to subtle portrayals of the dynamics of family life within the context of the rapid changes in 20th-century Japanese society. Frequently, his stories are narrated in the context of a search for cultural identity in which constructions of the West and Japanese tradition are juxtaposed. He was one of six authors on the final shortlist for the Nobel Prize in Literature in 1964, the year before his death.
Title: Yashichiro Takahashi
Content:  Yashichiro Takahashi (高橋 弥七郎) is a Japanese novelist best known for the creation of the Shakugan no Shana series. Shakugan no Shana was adapted into a radio drama, manga, anime, and a video game. In addition, it was adapted into an anime film on April 21, 2007. Takahashi also made another series titled A/B Extreme, which won Honorable mention in the eighth Dengeki Novel Prize. Most of his work includes references to the tokusatsu Choukou Senshi Changéríon (超光戦士シャンゼリオン).
Title: Genichiro Takahashi
Content:  Genichiro Takahashi (高橋 源一郎) is a Japanese novelist.

Question: Who is the author of Genma Taisen?
Answer: Kazumasa Hirai.