https://idolmaster-official.jp/news/01_16499

The Chikusei City Imas ambassadors have been formally revealed as Yukiho, Risa, Noriko, Haruna, Mei, and China.

The Chikusei fireworks show will be having an Imas segment this year as well, with the same arranger as last year. Yukiho will be doing the venue announcements.

Given they're using star mine fireworks, it would have been a good opportunity to have Misuzu be the GK rep and have her Begrazia song in the mix.