Kuu is scheduled to perform Sayonara no Mukougawa in a collab with Ikusaburo Yamazaki at the Music Fair episode on 08/07.
Info is coming from Aoi Shota's official staff Twitter, so it's not clear if that's all or why they are sharing that info about another artist at all (other than he being a big fan of her and being on the same episode).
Nothing official yet from Music Fair or Kuu and her staff.
https://mobile.twitter.com/AOISHOUTA...40996134424582