Ryûnosuke Eda is a second-year student at the Geika Institute of Fashion, specializing in men's fashion design. Confident and competitive by nature, he holds a strong dislike for elite privilege, which fuels his ambition to surpass those he considers superior. He views the prodigious designer Toh Ayano as a personal benchmark.

He has green eyes and pink hair that falls to his shoulders and is of Japanese nationality. His long-standing childhood friendship is with his classmate Kaoru Kizaki, who specializes in women's fashion at the same institute.

His motivations center on achieving success in the fashion industry through his own merit and effort, rather than inherited advantage. His actions reflect a focused individual dedicated to his craft and to exceeding the abilities of his peers.