So the SV tag is only there because one of the characters fantasizes about a rape? Nobody actually gets sexually assaulted, is that what you're saying? Please advise, I want to read this just for the fmc, but not if I get second-hand trauma from it.
There are some filler characters that are forced into sexwork with a comically evil villain that talks to people while getting head from them. And a lot of general sexual harassment. The FMC herself looks like she has a lot of plot armor against anything going too far, but people DO obviously try to harass her. I never read far into kakegurui but she basically feels like the same character without the O-faces, so the same dancing on the edge of the worst possible ending mindset.
TL;DR: SA tag is valid, but FMC has plot armor. Even if her thrill junky tendencies and the zero to hero MC that wouldn't be able to save her adds tension to that.
Subjective Bonus: There's no likeable characters either way if you're still considering dropping this.
