Riku Sanjo

is a Japanese screenwriter who served as head writer of both Kamen Rider W and Kamen Rider Drive. He was later one of the secondary writers on Kamen Rider Fourze and head writer of . He also played the Sweets Man in Kamen Rider W Returns: Kamen Rider Eternal.
He wrote the Futo Tantei manga series and serves as series supervisor for its anime adaptation, Fuuto PI.
He is also a secondary writer of the Satria Series (Knight Series), mainly , an Indonesian tokusatsu series created by Ishimori Productions.
==Writing credits==
===Television===
*Kamen Rider W (2009-2010)
** Episode 1 The W Search/Two Detectives in One
** Episode 2 The W Search/Those Who Make the City Cry
** Episode 3 Don't Touch the M/How to Get to Heaven
** Episode 4 Don't Touch the M/Play with a Joker
** Episode 5 The Girl... A/Papa Is a Kamen Rider
** Episode 6 The Girl... A/The Price of Lying
** Episode 9 The S Terror/The Maid Detective Witnessed It!
** Episode 10 The S Terror/The Great Detective's Daughter
** Episode 15 The F Afterglow/Burglary Rider
** Episode 16 The F Afterglow/Reclaim Your Partner
** Episode 19 The I Doesn't Stop/That Guy's Name Is Accel
** Episode 20 The I Doesn't Stop/Kamen Rider Style
** Episode 23 L on the Lips/Singer-SongRider
** Episode 24 L on the Lips/The Liar Is You
** Episode 27 The D Was Watching/The Transparent Magical Lady
** Episode 28 The D Was Watching/Twin Maximum Suicide
** Episode 31 The Wind Called B/One Must Chase The Beast
** Episode 32 The Wind Called B/Now, in the Radiance
** Episode 39 The Potential of G/Bad Cinema Paradise
** Episode 40 The Potential of G/I Can't Forgive You
** Episode 45 Who the K Needs/The Devil's Tail
** Episode 46 Who the K Needs/The Last Supper
** Episode 47 The Abandoned U/A Request From Philip
** Episode 48 The Abandoned U/Eternal Partners
** Episode 49 Goodbye to the E/A Bouquet of Justice to This City
*Kamen Rider Fourze (2011-2012)
** Episode 7 King Jerk
** Episode 8 Iron Calvary's Cooperation
** Episode 9 Witch's Awakening
** Episode 10 Moonlight Clash
** Episode 13 School Refusal
** Episode 14 Stinger Onslaught
** Episode 15 Christmas Eve Choir
** Episode 16 Right and Wrong Conflict
** Episode 19 Steel Dragon, Unmatched
** Episode 20 Transcendent Magnetism
** Episode 25 Graduation Reluctance
** Episode 26 Perfect Round Dance
** Episode 31 Subaruboshi Kingdom
** Episode 32 Super Space Sword
** Episode 37 Star Follower Selection
** Episode 38 Winner Determination
** Episode 43 Light and Dark Twins
** Episode 44 Star Luck Ritual
*Kamen Rider Drive (2014-2015)
** Episode 1 Why Did My Time Stop?
** Episode 2 What is a Kamen Rider?
** Episode 3 Who Stole the Woman's Smile?
** Episode 4 What is That Prideful Chaser Thinking?
** Episode 5 What Are the Steel Robbers After?
** Episode 6 Who Does the Warrior Fight For?
** Episode 9 How Can I Get Used to the Cool Body?
** Episode 10 What is in the Belt's Past?
** Episode 11 Who Can Prevent the Dark Christmas Eve?
** Episode 12 Where Did That White Kamen Rider Come From?
** Episode 13 Why Won't My Little Brother Put On the Brakes?
** Episode 16 Why is Rinna Sawagami Nervous?
** Episode 17 Who Will Control Deadheat?
** Episode 20 When Did Kyu Saijo Become a Roidmude?
** Episode 21 What Can Be Spoken By the Irregular Dead?
** Episode 22 How Can I Use the F1 Body to Fight?
** Episode 25 Why Has a New Battle Started?
** Episode 26 Where is Chaser Going?
** Episode 33 Who Claimed the Life of Shinnosuke Tomari?
** Episode 34 Who Claimed the Life of Eisuke Tomari?
** Episode 37 Who is Aiming for the Ultimate Taste?
** Episode 38 Why is the Devil Still Seeking Evolution?
** Episode 39 When Will the Whirlwind Kidnapper Attack?
** Episode 40 Why Are the Two Genius Scientists Having a Conflict?
** Episode 43 When Will the Second Global Freeze Start?
** Episode 44 Who Loves Heart the Most?
** Episode 45 What is a Roidmude's Last Dream?
** Episode 46 Why Must They Fight?
** Episode 47 Who Will You Entrust the Future to, My Friend?
*Kamen Rider Zero-One (2019)
** Episode 12 The Great Detective Has Arrived
** Episode 13 My Job Is the President's Secretary
===Movies===
** Kamen Rider × Kamen Rider W & Decade: Movie War 2010
** Kamen Rider W Forever: A to Z/The Gaia Memories of Fate
** Kamen Rider × Kamen Rider OOO & W Featuring Skull: Movie War Core
** Kamen Rider × Kamen Rider Drive & Gaim: Movie War Full Throttle
** Kamen Rider Drive: Surprise Future
==External links==
*Riku Sanjo at Wikipedia
* at 
* at 
Category:Writers
Category:Actors
Category:Head Writers
Category:Kamen Rider W
Category:Kamen Rider Fourze
Category:Kamen Rider Drive
Category:Kamen Rider Zero-One