The comic is a reference to Symphogear Live 2013. The seiyuu were asked to each design a new Noise. Mizuki Nana drew a samurai noise. In episode 3 of GX, Tsubasa was asked to draw a Noise. The results were very similar. Nana's noise, and a few of the other drawings, also made it into the show. http://i.imgur.com/R1g6rdu.jpg The seiyuu were also listed as character desginers in the credits.