Yoshihiro Suma is a Japanese manga artist and original creator known primarily for his work in the late 1980s and 1990s, particularly the erotic comedy series Ikenai Boy. Born on October 25, 1963, Suma began his professional career while still a university student, participating multiple times in the Best New Author awards hosted by the manga magazine Business Jump. He was a successful competitor, winning on two occasions before making his formal debut in 1986 with the one-shot Jitsuroku!? Sanryū Gakusei Ganbaru Mon!!, published in Business Jump. His first serialized work, Naughty Boy, followed in the same magazine the next year and became a significant success, establishing his reputation as a creator of comedic adult-oriented manga.

Suma’s most notable and enduring work is Ikenai Boy, which was serialized in Shueisha’s Business Jump magazine. The series ran from approximately 1987 to 1990 and was later compiled into five or six collected volumes by publishers including Home-sha and Office Men. The story follows Seiichi Kamikawa, a university student from a family of unconventional sexual counselors who use their abilities to resolve the romantic and personal problems of female clients. The series was adapted into two original anime video animations. The first, a 50-minute OVA titled Ikenai Boy, was released on April 27, 1990, with animation production assistance from J.C. Staff. A second OVA, Ikenai Boy: Ikasu Maruhi Hand Power, followed on September 28, 1990. Suma is credited as the original creator for both adaptations, which remained faithful to the erotic comedy and harem themes of the source material.

Beyond his most famous work, Suma continued to create manga throughout the 1990s. His other known titles include Submission to That Mind and Top Note, both serialized in Business Jump, as well as Angel Collection, which was published in Mister Magazine in 1997. His artistic identity is rooted in the erotic comedy genre that was popular in Japanese manga anthologies of the late 1980s. His work often centered on college-aged protagonists, supernatural or extraordinary gimmicks—such as the protagonist’s “magic hands” in Ikenai Boy—and episodic storylines focused on romantic encounters.

Yoshihiro Suma holds a specific place in the history of late-1980s manga and anime as a creator whose work successfully transitioned from serialized magazine success to the direct-to-video market that was expanding during that era. While his active publishing period was relatively concentrated, his work, particularly Ikenai Boy, remains a representative example of the erotic comedy genre from that period in the Japanese manga industry.