is a Japanese manga writer and screenwriter. He works as a story writer for manga, anime and live-action film. Sanjo graduated from Meiji University.
Dragon Quest: The Adventure of Dai (1989–1996), which he created with illustrator Koji Inada, is one of the best-selling manga in history with over 47 million copies sold. The two also created Beet the Vandel Buster (2002–2006, 2016–present), which has 4 million copies in print.
Selected works Anime OVAs MD Geist (1986) Cybernetics Guardian (1989) The Guyver: Bio-Booster Armor (1989–1990) MD Geist II: Death Force (1996) Ultraman Super Fighter Legend (1996)
Television series head writer denoted in bold Gaiking: Legend of Daiku-Maryu (2005–2006) Happy Lucky Bikkuriman (2006–2007): eps 20-46 GeGeGe no Kitarō 5th series (2007–2009): eps 27–100 Digimon Fusion (2010–2012)
Film Gegege no Kitarō: Explosive Japan!! (2008)
Manga Dragon Quest Dragon Quest: The Adventure of Dai (1989–1996) Dragon Quest IV Gaiden -The Labyrinth of Hell (December 2001-January 2002) Dragon Quest: Dai no Daibouken - Yuusha Avan to Gokuen no Maou (2020–present)
Other Manga Ultraman Super Fighter Legend (1993–1997): as Ryu Sagawa Beet the Vandel Buster (2002–present) Fuuto PI (2017–present) (2018): as Rokurō Sano
Live-action TV series head writer denoted in bold Cutey Honey The Live (2007) Kamen Rider W (2009–2010) Kamen Rider Fourze (2011–2012) Zyuden Sentai Kyoryuger (2013–2014) Satria Garuda BIMA-X (2014–2015) Kamen Rider Drive (2014–2015) Kamen Rider Zero-One (2019–2020) Mashin Sentai Kiramager (2020)
Live-action films Kamen Rider × Kamen Rider W & Decade: Movie War 2010 (2009) Kamen Rider W: Begins Night Kamen Rider W Forever: A to Z/The Gaia Memories of Fate (2010) Kamen Rider × Kamen Rider OOO & W Featuring Skull: Movie War Core (2010) Kamen Rider Skull: Message for Double Movie War Core Kamen Rider Eternal (2011) Piece~Fragments of a Memory~ (2012) Zyuden Sentai Kyoryuger: Gaburincho of Music (2013) Zyuden Sentai Kyoryuger vs. Go-Busters: The Great Dinosaur Battle! Farewell Our Eternal Friends (2014) Zyuden Sentai Kyoryuger Returns: 100 Years After (2014) Kamen Rider × Kamen Rider Drive & Gaim: Movie War Full Throttle (2014) Kamen Rider Drive: The Challenge From Lupin Movie War Full Throttle Kamen Rider Drive: Surprise Future (2015) Drive Saga: Kamen Rider Chaser (2016) Drive Saga: Kamen Rider Heart (2016) Drive Saga: Kamen Rider Brain (2019)
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