"Rasen no Yume" (螺旋のユメ) is a single by Japanese visual kei band SID, released on August 2, 2017, by Ki/oon Music.
Directed by Yasuhiro Arafune, the video was made with computer graphics and shows a knight in armor rescuing a princess taken hostage.
[2][4] The lyrics for "Rasen no Yume" were written by vocalist Mao, as usual, and the music was composed by bassist Aki.
The website also mentioned that "Rasen no Yume" has a unique pop style, matching the "charm" of visual kei.
[5] Ayumu Murase and Real Sound praised SID's ability (especially Mao's lyrics and Aki's composition) to faithfully express the anime's themes.