Great game. This is exactly the kind of story I hope for when I think "romance with a dominatrix". I hope the plot keeps slowly expanding without rushing to a conclusion. Characters aren't quite as deep as my ideal for a heroine, but they are all likable and engaging to interact with.
Reina is my favorite personality-wise, though fetish-wish I'd probably lean more toward Chika and Kasumi with their hard fetishes. Second place personality-wise is probably Catherine, casually ruthless is the perfect kind of ruthless, and on top of that she's actually surprisingly cute with how she spared Gaijin.
I've decided my MC is named Ao since it's a rare Japanese male name that's 2 characters long. Feels like it fits the setting better that way, where main girls and many other girls have Japanese names.
Major props to the dev for properly sizing the text instead of relying on bad Ren'Py defaults. I almost never see that in original English language VNs. (I do wish I could add periods to the ends of the sentences, though.)