I certainly have better luck there compared to FKG.
All the time I played, only one rainbow got pulled from the gacha and that is Wax Vine. 250 FGs spend on getting Dusty Miller and I got someone else
Meanwhile, a year of playing Kamihime as f2p, and I got around 8 SSRs And that is only playable girls and not in addition to other SSR gacha summons.
If you ever decide to play, come to Discord. We got a big shitposting community to keep us entertained