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Ichirō Ōkouchi (大河内 一楼 Ōkouchi Ichirō?, born on 28 March 1968 in Sendai, Miyagi Prefecture) is a Japanese screenwriter and novelist. He is a graduate of Waseda University, School of Human Sciences.

In 2006, Ōkouchi collaborated with director Gorō Taniguchi for composing the story and script of the Sunrise original production, Code Geass: Lelouch of the Rebellion and its sequel Code Geass: Lelouch of the Rebellion R2 in 2008.



  • Turn A Gundam (Screenplay; 1999)
  • Angelic Layer (Series composition, screenplay; 2001)
  • Turn A Gundam II: Moonlight Butterfly (Screenplay; 2002)
  • Overman King Gainer (Series composition, screenplay; 2002)
  • Azumanga Daioh (Series composition, screenplay; 2002)
  • RahXephon (Screenplay; 2002)
  • Wolf's Rain (Screenplay; 2003)
  • Stellvia of the Universe (Screenplay; 2003)
  • Planetes (Series composition and screenplay; 2003)
  • Mahou Sensei Negima! (Series composition, overall plot and screenplay; 2005)
  • Eureka Seven (Screenplay; 2005)
  • Brave Story (Screenplay; 2006)
  • Code Geass: Lelouch of the Rebellion (Original story, series composition, screenplay; 2006–07)
  • Code Geass: Lelouch of the Rebellion R2 (Original story, series composition, screenplay; 2008)
  • Shigofumi: Letters from the Departed (Series composition, screenplay; 2008)
  • Magic Tree House (Screenplay; 2011)
  • Guilty Crown (Assistant series composition; 2011)
  • Berserk Golden Age Arc I: Egg of the Supreme Ruler (Screenplay; 2012)


  • Revolutionary Girl Utena 1: Ao no Sōjo (1998)
  • Revolutionary Girl Utena 2: Midori no Omoi (1998)
  • Martian Successor Nadesico: Ruri no Kōkai Nisshi (1998)
  • Martian Successor Nadesico: Channeru Ha Ruriruri De (1998)
  • Martian Successor Nadesico: Ruri A Kara B he no Monogatari (1999)
  • Mobile Suit Gundam: The 08th MS Team (1999)
  • Akihabara Dennō Gumi: Tsubame Hatsu Taiken!? Kurabu Katsudō Sentō Chū (1999)
  • Starbows (2001)
  • Chicchana Yukitsukai Sugar (2002)

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