It's bring your bunny to the pool day.
This gacha is the first instance of the "Shiny Expansion" gacha. Changes to illustrations and outfits may occur when upgrading the idol.

Limited P-SSR【NoNoNo:Bunny】Ikaruga Luca

https://twitter.com/imassc_official/status/1958048099664072797

Animations:
https://twitter.com/imassc_official/status/1958048558571221143