HAND in hand エウレカセブン
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About Us

About Us

Storyriders co.,ltd. was set up in 2007 as a management office for Dai Sato and his scriptwriting team.


Company Name

Storyriders co.,ltd.



Mimami-cho Compound C,

1-24-10 Kichijoji Minami-cho,

Musashino-shi, Tokyo, 180-0003

Tel/Fax +81-(0)422-46-7650



Dai Sato



Naruki Nagakawa, Muga Takeda, Atsushi Kaneda, Daichi Kagawa, and Takako Baba


Main Financing Bank

The Bank of Tokyo-Mitsubishi UFJ, Ltd. Kichijoji Branch


Main Business Activities

Planning, concept development and scriptwriting for:

visual contents, interactive contents (e.g. games) and other various publications/media



Dai Sato (born in 1969

Dai Sato started his career as a TV script writer/program planner and a lyricist at the age of 19, and later ventured into the video game and music industries. Today, he is first and foremost an animation scriptwriter, with side projects creating scripts and concepts for various media. In 2007 he created Storyriders Inc., Ltd. of which he is the president and CEO.


As scriptwriter:

TV Animation: Eternal Family, Cowboy Bebop Ghost in the Shell -Stand Alone Complex, Wolf's Rain, Kenran Butoh Sai ("Mars Daybreak"), Samurai Champloo, Psalms of Planets -Eureka Seven, Ergo Proxy, Freedom, Battle Spirits -Shounen Toppa Bashin, Eden of the East
Game: Ace Combat 3 -Electrosphere
Film: Casshern
Novel: Nō R Gyuru: Nōwaku Kōshi ("Noire Gyuru: Brain Ambassador," based on the novels of Kyusaku Yumeno with scenario written by Sato Dai)



Naruki Nagakawa(born in 1974)

Naruki Nagakawa became fascinated by theatrical performance during his student days and started his drama group where he was active as an actor and a playwright. After graduation, he joined TAITO Corporation as a game planner, later moved to Sony Computer Entertainment before he started working as a freelance scriptwriter/game planner.


As scriptwriter:

Game: Eureka Seven NEW WAVE, Eureka Seven NEW VISION, Dragon Ball Online

TV Animation: Ergo Proxy, Battle Spirits -Shounen Toppa Bashin

Comic: Eureka Seven Gravity Boys and Lifting Girl, Lion-Maru G

Novel: Nō R Gyuru: Nōwaku Kōshi,

Other works:

Densha de GO! -Bullet train Sanyo Shinkansen (game structure developer), PS2 Operator's Side (scripting, database creation/management), novels and other publications under an alias


Muga Takeda (born in 1977)

Muga Takeda has been active since his student days, where he did a narration for a Swiss environmental protection video and wrote columns for Nagano local newspaper, while majoring in Japanese Literature. After graduation, he experienced film/drama production work, and moved onto producing artists' promotional videos as a producer, planner, sub-director and director. Muga is currently a scriptwriter for animation, comics and others.


As scriptwriter:

Comic: Ergo Proxy- Centzon Hitchers and Undertaker, Lion-Maru G

TV: STYLE JAPAN MUSIC (omnibus drama)

TV Animation: Battle Spirits: Shounen Toppa Bashin

Novel: Nō R Gyuru: Nōwaku Kōshi,


Other works:

TV travel show "tropical night in Thailand" (director), TEPCO - Tokyo Electric Power Company TVCM (planning), omnibus drama (director), promotional videos for actress/models/idols e.g. Eiko Koike, MEGUMI, Chinatsu Wakatsuki (director), novels and other publications under an alias