GARNiDELiA

The duo first collaborated on the song "Color," which was used as the opening theme to the 2010 anime _Freezing_. The name of their unit came from the French phrase "Le Palais Garnier de Maria" (Maria's Opera), and the asteroid Cordelia, which was discovered in 1978, the year of Toku's birth.

In 2014, they made their debut under major record label Defstar Records with the single "ambiguous," which was released on March 5, 2014. Its title track was used as the second opening theme to the 2013 anime _Kill la Kill_.

On 2 September 2025, GARNiDELiA announced that they would be going on indefinite hiatus, with all upcoming tour dates being canceled. MARiA gave a statement alleging that her agency had not properly compensated her for her activities over the years. According to MARiA, after she submitted a termination notice to her agency through her lawyer in August, the agency announced the band's hiatus before she had the opportunity to discuss the matter privately with toku.