Yeah... but I'm not a fan of the execution. The whole "low battery that doesn't recharge" analogy instead of just saying she has clinical depression feels so... coddling. Kurose is more than old enough not to be talked to like that. And with how easy it is to find information on the internet these days, it's not like saying "she has clinical depression" would scare people their age or make them treat Mio like a leper... unless this is one of those cases where clinical depression is such a big taboo in Japan that we Westerners don't know about it, so it has to be treated with kid gloves.
Also, bringing it up while Kurose was dealing with his own stuff feels like a bit of drama overkill. The author could have chosen another time in the story to address it. Unless... the author is doing it now because there isn't much story left. Which would be weird, considering this manga is selling like hot cakes.
But that's just my opinion, which I'm sharing with Moz. If anyone thinks it was masterfully done, they're free to think that.
Putting aside how Japan has it's own issues with mental health (not nearly as many steps up the ladder from "woman complaining? Hysterics, put her in an asylum"), this battery analogy is literally the
specific example I've been using in my own life for decades now to describe my own fight with depression almost 1-to-1, with the only difference being I explain that I have a lower max charge too, although unlike Haimiya I dropped out of highschool directly because of it. I could go into it more but nobody here is my therapist, but the point is I can personally say it's a pretty damn good example/explanation of depression and not some kinda watered down version of it. Because an analogy like that works a lot for people who don't really understand depression because it's real and, to be frank, a lot of people just straight up do not understand what depression is. Hell, I barely even understand what it is sometimes! We can look at it from the Watsonian perspective that it's a teacher trying to explain something to a student/friend not knowing how much they'd actually know about the topic, or a Doylist perspective in that it's a way to explain it to audiences who also might not fully clock it, but regardless; it's still an easily understood analogy.
If anything it makes me happy that we aren't getting the standard form of it, where a character who has depression or is going through a depressive episode will have their door knocked on, let a friend in, a party or something is thrown and then suddenly they're fixed from having the Big Sad™ and the topic never comes up again because They're Cured™. And to be honest even if something similar does happen in this series, fundamentally it wouldn't be the same as that "playing around with a thesaurus picking depression as the word of choice for sad" standard fare, because Haimiya both being on her meds and going off her meds because she thinks she's having a better time and doesn't want to be held back by them is
also super fucking relatable are the type of thing that fundamentally means the author has done their own research and/or experienced this to some degree in their life.
The only complaint I could make would be that this is a tonal whiplash, but in my eyes I like it because it's not wishy-washy bullshit. That and be the nurse saying that it's not something medicine can help with, which is both technically true and untrue at the same time, because depression meds are a constant battle of trying to get something that works and the right dosage, making sure it actually works which can be weeks/a month of pain because that's how long for these things to actually take effect if they do at all, and even when you finally land on that after years you still have to be consistent with it, and there's a chance that the medication could one day just stop working for you with that dosage because your body "got used" to it (I AM NOT A DOCTOR I DO NOT KNOW HOW THIS SHIT MEDICALLY WORKS) so there really isn't a pill you can pop like a Tylenol to help with a headache or something.
And all of this is without going into the fact that it could be a slew of other types of mental issues too. Depressive episodes are something you can definitely feel "coming on" for any variety of reasons, but there's also a variety of other things it could be like severe anxiety or agoraphobia since the festival's coming up or anything else, but that's something to be revealed as the story goes on. Regardless, I firmly believe now after writing all of this that I think the author has some form of experience with this or has done some REALLY long research on this topic specifically, but it seems more likely to be the former what with how little this has been at the core of the manga up to this point as it's unlike manga where anything brain-problemy tends to be in the title in bright red letters.