Yui Ishikawa is a Japanese actress who was previously represented by Sunaoka Office but now works for mitt management. Prior to becoming a voice actress, she worked mainly on stage. Her specialities are classical ballet, jazz dance, and tap dance. Before she started as a voice actress, she was a stage actress and has been voicing radio dramas since 2007.

Qualidea Code is a Japanese multimedia project co-published by Shueisha's Dash X Bunko imprint, Fujimi Shobo's Fujimi Fantasia Bunko imprint, Media Factory's MF Bunko J imprint, Shogakukan's Gagaga Bunko imprint, and Shueisha's Jump Square magazine. The original concept was developed by Marvelous and a three-person unit of writers known as Speakeasy made up of Kōshi Tachibana, Sō Sagara and Wataru Watari. It launched in 2015 with several light novels, and a manga began serialization in Jump Square in 2016. An anime television series, produced by A-1 Pictures and directed by Kenichi Kawamura, aired between July and September 2016.