The Casino is not available at the moment, along with most of Ars Delusia. It's a work in progress, so stay tuned, and in the meantime, don't hesitate to explore the rest of the game and to check out
Yes. Fetishes and Sensitivities gained from Perks cannot be removed.
Aside from typical boss stuff like making sure to use weaknesses and status cure items (remembering also they're an optional boss so are tougher than you'd expect for where in the game they are) there are a couple of things I can think of for this fight in particular. First what version of Kotone's perk you have makes a big difference, the "slave" version makes fights like this a lot harder than the "lover" version. Also it can make a difference which order you defeat the sisters in; take out Mizuko first and all that ass fetish she has been giving you doesn't apply to defeating Himika, who'll start giving you breast fetish instead. If you take out Himika first and you then have to beat Mizuko, she'll keep taking advantage of your already high ass fetish and piling even more on.
In addition to the post by Master of Puppets, you can lock Mizuko in kiss stance and slowly finish her off before fighting Himika.
Make sure you visit the church regularly and pay off your sensitivities... I used to keep my Ass and Monstrous fetishes high (because they are realistic... I mean, that's absolutely me), but hey made some fights much harder than they needed to be. Keep your fetishes low and that should help.
Advancing the relationship is what lets you convert the "slave" perk into the "lover" one. I don't know what happens if you ask her to remove it completely, I've never tried that.
Haha, twenties?
How much Spirit do you have? At that level you might lose one or two but you can beat the girls (iirc... it's been a long time since I was in double-digit levels).
Buy Fairy Dust from Amber (and possibly the Fairy Circle Ring accessory as well) against paralysis, and have a plan to deal with the lizzies. They're fairly sensitive to Pain and Seduction moves, so if you can deal that kind of damage, you should be able to deal with them pretty swiftly.
If you mean the "Skip read text" feature, I'm afraid not. MGD has modified Ren'Py's standard functionalities to the point that features such as this one no longer work.
Spamming mass seduction is also a good strategy.
That's a shame. How people keep track of what they read and what not with the new updates?
Each update comes with a changelog (which you can find wherever the game is available, be it itch.io, Patreon, Discord, or Subscribestar) which lists the new content, in addition to any fixes, balance tweaks, and such. This should let you see easily what's new and where it is.
That's under consideration, but it is a Whole Thing, so it's remained on the backburner for now.
The Capital is a whole area with multiple sub-areas, characters, events, etc. It's getting fleshed out a little more with every release, but given its scope, there's still a lot to go through.
I was fairly low level (forgot what it was, but every fight was challenging if I decided to shut brain off and spam), but using a defense+aphrodisiac build and carefully managing mana and buffs made me stay low level and catch up to the game.
