All the food that Artemis eats, yet we never see her poop.
Not that kind of VN - look for Japanese titles.
I thought it was obvious. Bracket responses are non-verbal. Non-bracket responses are things you say.
If it was that obvious, I'd have noticed it.

But, I'll check that hypothesis - seems feasible, though I think it might be that "no bracket" represents precise words that will be spoken, while brackets indicate a direction that might be a thought, an action, or a combination of thought and action, or a combination of words and action, though not those precise words, since both bracketed items in the "triple" did lead to dialogue consistent with the prompt - the first being mere conversation, the third being a command to Artemis and an action engaged in by her. The result of the third choice, in this respect, is not too dissimilar from the second item, just not as funny and it didn't lead off with a quote of the prompt.
all the food MC eats and you never see HIM poop and he is protagonist so almost always have screentime unlike artemis...
The one reason this argument isn't quite as strong is that we all know that properly functioning humans poop, so no need to address that for the human characters. Artemis is not human, but she is consuming as humans do and, as yet, I don't think we have an explanation as to how efficiently she converts what she consumes and whether any waste arises. Due to conservation of mass, there has to be SOME mechanism, or she'd simply continue to gain weight and they'd have to rename the VN "Artemis - My 1,000lb Android".
So, either she has a very efficient digestive system that breaks down everything she consumes to the molecular level and aerosolizes and expels excess elements via breath (or gas

), or the scene where she declares "I'm leaking sludge from my butt!" simply was a step too far and will just not get directly addressed, but will be allowed to be an assumed, though unconfirmed, element of her near-humanity. However, if she does metabolize and excrete as humans do, and if it gets addressed, I'd expect it to be some kind of "KINDRA! I'm broken! I'm dissolving!", then Kindra runs in, sees what's going on, and takes her aside with some kind of explanation like "Ah - we need to tell you what a "bathroom" is and how to use it." but without getting too graphic.
This episode did address that Koko
now has to be taken for walkies to expel old fluid and then consume new since June wasn't able to precisely replicate the "blood" that Nora had invented, so a similar topic has been addressed - it's just a little easier to do it with a dog, I suppose.