Aimi did address her breast status a couple of times on twitter, reacting to some user reviews that referred to her breasts as fake."Perfect Natural" is a good phrase. Like science so advanced it's indistinguishable from magic.
Tsuji Saki (and Yumeno Aika, whom I also adore) have breasts so wonderful they're indistinguishable from enhanced ones.
I'm fine with that.
(As an aside, I recall a scene in SNIS-195 where Aika is asked if her boobs are enhanced; she says, "They're all me," which I thought was being intentionally cryptic.)
And though it doesn't prove anything, Aimi's twitter bio says she wants to be a "living work of art".
If she has an ideal artistic body shape and she went under the knife to achieve it, more power to her.
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Of course her word isn't definitive proof, but she does not seem reserved or secretive when it comes to the topic of her breasts.
Obviously her breasts are extremely perky and well shaped, which always leads to some suspicion, yet I still haven't seen any conclusive signs of implants other than "they look too good to be true".
Take a look at this gif, the way she squeezes her breasts between her fingers lets absolutely no room for any implant, they give hardly any resistance to the pressure and react 100% like rather loose fat tissue.
https://www.redgifs.com/watch/desertedoutlandishflyinglemur
Also with other position in this on, nothing suspicious
https://www.redgifs.com/watch/immaculaterotatingfennecfox
The massage section in her movie pppd-838 pretty much seals the deal imho. The position laying on her back with her arms up like this would probably expose even the best breast augmentation.