(Uh, another thing I forgot to tell you! If I can give you a suggestion about the layout, maybe you could make the font size a bit bigger? This one is very little and makes it a bit hard to read^^" As I've said, just a suggestion! I'll shut up now, I promise lol)

Chapter 1: (Oh, one thing though! I gotta say I love the use of many coordination when the character's thoughts seep into the narration; let's say it is some sort of very simplified version of the stream of consciousness, that I appreciate a lot though, because I think it serves the purpose very well)

Also, leaving the structure matter aside, I must say your style gets kind of poetic at times: you make use of certain expressions that just rapture my attention and sweep me away; I really like this about they way you write and describe things. It is a quality I appreciate very much in the fics I read and I want to really congratulate you on this. It's really nice!
(I'd make some examples but I see that I can't copy the sentences and I admit I'm pretty much a lazy . Don't hate me ;; )

Aaaand I think that would be it.
I deeply apologize for this train-wreck of a comment because it was just awful and I really hope you haven't misunderstood anything I said and that I didn't sound offensive in any way orz
I'm looking forward to the next chapters, because I'm really curious to see how you'll develop this story :3
Have a great day <3
Ps: I'm sorry I had to split the comment ; ;

Chapter 1: Going on to your writing style, you tend to do something I usually don't appreciate that much, and that would be making a great use of coordination over all.
People who prefer coordinates over subordinate clauses usually tend to make rather short and sharp periods (another thing I don't like too much, most of the time), but that was not your case; on the contrary you tend to make very long sentences (where readers can easily lose their focus - at least that was my case) and to use lots of commas to help them "take a breath" during the sentence.
(sometimes though they feel to be a bit too much)
As I've said, I admit I'm not very fond of this type of narration because I easily lose my focus while I read the period and end up feeling a bit overwhelmed by all the clauses put together with no real stop in between. But this is more of a personal opinion. What I mean is that me liking this about how you write or not shouldn't matter that much to you, since it's only a deal of personal tastes and what matters in the end is your opinion as the author: it's your style, key word being "your". It's only yours, it's your distinction and you should be the one who likes it. (Idk if I explained myself well^^" I wanted to tell you what I thought about it for the sake of sharing with you my whole opinion about this chapter. But writing style is really something too personal and readers' tastes have no say in it, so I didn't want to imply you have to change your style or anything like that! Damn...I'm really awful at this lol)
So, putting aside the sentence structure, the only thing I can actually suggest you is to reduce the commas a tiny bit (because some of them are grammatically unnecessary and thus become counterproductive during the reading).

Chapter 1: Hello there! :)
I'm honestly wondering how the hell I managed not to notice you write stories, considering how many you post (and how many involve Key; I'm such a er for key pairings orz). But...it's always later than never, right?
So here I am, stopping by to leave you a little comment on this fic, before going to explore your other ones. I must apologize in advance: I a big time at commenting - I'm really messy and often don't have relevant things to say and...yeah, I'm awful lol

Rambling aside, let's start with saying I'm definitely attracted to this story: I have been looking for a multipairing and key-centric fic for a long time (it feels like I've almost read them all), thus I'm definitely happy I found yours! This first chapter didn't let out much about how you'll introduce the other pairings and I admit I can't help but feel intrigued by all of this: I still can't forsee how you intend to structure the plot and I'm so curious about it :3 I'm honestly looking forward the future developments :)

I also like the whole atmosphere and the fact that you decided to reconnect all of this with Autumn: you didn't insist that much on this point in this first chapter, but still I evinced from the foreword (that was btw really enticing**) that this season will have a key role in your fic and I am kind of excited. I have a particular fascination with autumn - I find it magical -, and I like how you seem to intend on playing with the contrast between autumn and winter :) I find it wonderful!
Plot-wise, this first chapter was rather simple but still it played a cute scenario (a bit cliched but always very much appreciated**) and it has been enjoyable to read^^ For this reason though I don't have much to say about the plot yet, I'm afraid^^"
I'll wait for the next chapters to make any comment about it

Can't wait...

Update soon author nun I'll be waiting^^