DNE (Day Night Explorers) released a song cover "アイドル (IDOL)" by YOASOBI. One of the member of AS☆FIRE, Yuu (other stage name "Fae") participated in this song collaboration cover with other Idols.

DNE or Day Night Explorers is a collaboration project which involves covers, streams, podcasts, and much more.

Aside from Yuu, these are the other idols who participated in this song cover: Ashley from DNE, Rena from Hoshizora 星空, Juu from PiPaPosse, Shuri (Indonesian Singer), Kang from Seishun Kakumei (青春革命), and Sunny from Mju:z Kiss.

You can check out and watch their song cover on Day Night Explorer's Official YouTube Channel.