https://idolmaster-official.jp/news/01_16326

Anzu and Riamu will be on a NHK Radio show this autumn, this will turn out well. They're accepting messages and song requests until the end of the month.
https://forms.nhk.jp/jfe/form/SV_5sFRENQiKYuIVpk

https://www.nhk.jp/p/rs/7NQKYM25YX/