Yuichiro Higashide is a Japanese writer and novelist known for his work across visual novels, light novels, anime, and games. Born on July 30, 1978, his career began as an in-house writer for the visual novel brand Propeller, a subsidiary of Will Plus, where he was a core member of the team. He initially worked at a general company after graduating from college before joining the company at the recommendation of a friend. During his tenure at Propeller, he served as a director and gained recognition for writing the scenarios for several successful visual novels. After leaving Will Plus in 2011, he transitioned to a freelance career, expanding his work into light novels and anime adaptations while maintaining a close collaborative relationship with the creative studio TYPE-MOON.

Higashide first achieved prominence with the 2005 visual novel Ayakashibito, a work that remains highly regarded and established his reputation as a notable scenario writer. Other key visual novel credits from this period include Bullet Butlers, Evolimit, and Tokyo Babel. His foray into light novels included his own series such as Beast Hunt, which ran for eight volumes, before he began a significant collaboration with TYPE-MOON. This partnership led to his work on the Fate franchise, beginning with the Fate/Apocrypha light novel series published between 2012 and 2014, which was later adapted into an anime. He subsequently contributed scenario writing for major game releases like Fate/Grand Order, Fate/EXTELLA LINK, and Fate/Samurai Remnant.

A notable example of Higashide's original work is the Date A Bullet series, a spin-off of the Date A Live franchise. For this project, he served as the writer of the light novel series under the supervision of the original creator, Koushi Tachibana. The series was published by Fujimi Fantasia Bunko, consisting of eight volumes released between March 2017 and January 2022. He also wrote the screenplay for its two-part theatrical anime adaptation, Date A Bullet: Dead or Bullet and Date A Bullet: Nightmare or Queen, which were released in 2020. In these productions, his role is credited as both the original creator of the spin-off narrative and the scriptwriter for the films.

His career demonstrates a pattern of transitioning from original visual novel creation to working within established franchises. Beyond his original works, his adaptation history includes serving as series composer and scriptwriter for anime such as Fate/Apocrypha, School-Live!, and Tokyo Babel. His artistic identity is frequently associated with handling large casts of characters in action-oriented narratives and incorporating elements such as beast-human characters and military themes into his stories. His contributions to the Fate series, particularly through Fate/Grand Order, have solidified his standing as a significant figure in the contemporary Japanese game and anime industry.