When she read the popular manga series Slam Dunk, she was inspired to create a gay love story based on the characters of Kogure and Mitsui.
She made her professional debut as a manga artist in 1994 with The Moon and the Sandals, serialized in the newly-founded Boys' Love magazine Hanaoto.
At a young age, she read shōjo manga depicting homosexuality, such as Patalliro!, Kaze to Ki no Uta and Hi Izuru Tokoro no Tenshi.
"[2] Outside of her work with Japanese publishers, she also self-publishes original doujinshi on a regular basis, most notably for Antique Bakery.
Yoshinaga has also drawn fan parodies of Slam Dunk, Rose of Versailles, and Legend of Galactic Heroes.