So far so good, pal! I'm liking where this is headed
On the lines of critique; nothing that hasn't been said before.
Everything seems to happen a little quickly, like the school day only seemed to last a few hours, yaknow?
But that being said, it's a very common problem; one that I myself fall victim to painfully often.
On top of that, I'm afraid I can't help but agree that Hisao seemed to be a little too ready to open up about his heart condition. I know he's being protreyed a bit different from the VN, but it is noteworthy that at least for the first act, he suffers from a bad case of
Melodram Patheticism
Also being a Natsume fanboy, meself, I can't help but note that she seems surprisingly agile for someone suffering Rheumatoid Arthritis, with her jumping and high fiving. But hell, it's not like there's any official depiction we can refer to, so carry on as you are!
Apart from that, what can I say?
Story's coming along nicely, I'm liking Naomi's character and I can't wait to see how you deal with
the inevitable seizures
Keep it up, mate

you're doing good