Okkkk so swimsuit set, looks like it could be an underwater cave themed-like set, judging from the background
OH!!! I JUST NOTICED, THE STAMPS (I think)!!!
So the darker blue is obviously Tae, light blue looks like Hina, green could be Maya or Rokka, reddish-orange(?) looking like Kasumi or Hagu, aaand I'm drawing a blank on the farthest one, I think it's probably Tsukushi?
Hina's probably the other 4* seeing her stamp with Tae's
Seeing the colour of the text, Maya/Rokka's the gacha 3*