Yunosuke Yoshinaga, also known by the pen name Yoshinaga Yunosuke, is a Japanese manga artist best known as the creator of the action mecha series Broken Blade. His professional career began in 2000 when he made his debut under the name Yoshinaga Yusuke with the manga Metal Wind, a five-volume series centered on motorcycle themes. He later changed his pen name to Yunosuke Yoshinaga around 2006 when he started serializing his most famous work.

Yoshinaga is also the author of Rampage, a manga that offers a loose adaptation of the Chinese legend of the Three Kingdoms. The publication of Rampage was disrupted in Japan due to a change of publishers, and the series was ultimately halted after three volumes as Yoshinaga focused his efforts on the successful Broken Blade.

His major work, Broken Blade (also known as Break Blade), is an action manga featuring mecha. It began serialization on September 12, 2006, in the magazine Shonen Blood. The series later moved to the web magazine FlexComix Blood in 2007 and then to Comic Meteor in 2012, where it continued until its conclusion on October 12, 2022. The complete series was collected in twenty tankobon volumes. The story is set on the continent of Cruzon, where people can manipulate quartz for power. It follows Rygart Arrow, a student who cannot use this magic and pilots an ancient, non-functioning golem known as the Delphine.

The success of the manga led to a significant adaptation history. Between 2010 and 2011, the series was adapted into six animated film episodes. In 2014, these films were recompiled and edited into a twelve-episode television anime series. The anime production involved notable studios, including Production I.G and Xebec.

Regarding his artistic identity and industry significance, Yoshinaga is recognized for his work in the mecha genre, and Broken Blade is often cited as a standout series that blended classic genre elements with unexpected narrative developments. He is known for having a strong personal vision for his stories, reportedly clashing with editorial staff over the direction of Broken Blade to ensure his ideas were faithfully represented. His dedication to the series was intense, particularly in its first year of serialization, during which he was said to have taken only about ten days off. His creator-driven approach and the success of Broken Blade have cemented his reputation as a notable figure in the field of manga, particularly for seinen and shonen action series.