Sell me on Sumi, is she just as coomer as Finana?
For me, the appeal of Finana is how naive & innocent she is regarding realistic romantic relationships, while also being a completely degenerate kinky slut for the type of shit she sees in her "anime 2"s. She seems like the type of girl that, after you get along with her for a bit & went on a couple of dates with, would completely open up in bed with you and let you try all of your fantasies out on her. The relationship would almost entirely be built on sex, which isn't great for long-term romance or life goals, but is fucking amazing in the short-term or at least until one of you gets bored of the other. Basically, Finana is the ultimate fuckbuddy, but not one you're likely to wanna date seriously.
If Sumi is even anywhere close to that then she's top-tier coomerbait for me too.