Okay, I just finished Act 3, but I can't keep going any longer. I need a breather, and at the risk of making myself look stupid again, I'll try to review these parts before moving on to the last act sometime later.
First of all, I can see now that there is a good reason why this thread is 57 pages long.
I think you are one truly talented writer.
I do envy the way you are able to create memorable characters basically out of thin air, and create a story of this length that (minor hiccups aside) feels so well paced. I admit that I was skeptical of reading a KS fanfic where Hisao is not the narrator (although many people seem sick of him here, to me it's almost something of a genre requirement
), but you managed to turn that initial skepticism around incredibly quickly.
The first two acts were nothing short of a true delight. Loved Suzu's character, her unique way of narration (though I'd suggest using some semicolons on occasion), her tangents (Stumpfist! XD), daydreams, the way her dreams melded into reality. The twist at the end of Act 2 may have been an age-old plot device, but it was executed so masterfully that I never thought of complaining about it for a moment. And all those hints during the dream too... simply put, it was awesome.
This really is a story that can only be told from Suzu's point of view and no one else's, and man, did you use the opportunity to its fullest.
And yet... here I am, at the end of Arc 3 after choosing what appears to be the "correct" answer at the choice point, and I still cannot help but feel sad. I'm sad because, as much as it pains me to say this, the opportunity I mentioned above has turned out to be a double edged sword.
The pacing of the plot suffered a little here, as others have pointed out. I think the main problem might be that you brought up Suzu's hidden secrets and her fear of the future a bit too quickly, but obviously couldn't solve them straight away, and so things have been drawn out somewhat. Of course, they were there from the very beginning to an extent with the Battleship games and all, but you actually had a very good opportunity to momentarily put them on the backburner after Suzu won the game. In this aspect, the story reminds me of Emi's route: there, her father's death is the big secret that keeps her and Hisao apart, but a whole lot of things happen before the story starts introducing that issue in earnest, giving Hisao and Emi some time to bond first. It might have helped here too.
But actually that wasn't the most seriously problem, I feel. I realized this only after Suzu finally opened up to Hisao, and the uneasy feeling in my gut still refused to go away. Something changed about Suzu herself, and not for the better.
I find it almost bewildering when she refers to her former self at the beginning of the story as something negative, something she improved from. I don't see what she's getting at, even in retrospect. The Suzu at the beginning seemed like a fairly balanced individual; she's learned to live with her condition, she had a friend she can count on (and who can count on her; Miki's phantom pain scene was great) and things seemed to be pretty good. Well, okay, she was playing Battleship with the Grim Reaper, and she obviously hated that, but even that was treated in a slightly stoic, "oh well, that's life" manner.
In contrast, the Suzu in Act 3 spends most of her time crying, angsting, musing about how much narcolepsy sucks, wallowing in inaction and self-hatred, and then crying some more. And, my good Lord, I've read through every single part of that in her first person narrative. I suspect it might not have been so bad when people went through it one chapter at a time, but all at once like this, it's positively exhausting. Of course I know that you need to face your problems before you can put them behind you, but this is like a bit too much. Actually, not just a bit. It has gotten to the point that I swear, if I spot the phrase "I don't deserve this" one more time in her internal monologue, I'm going to scream.
It doesn't help that so far Hisao is more or less just tagging along. The canon KS routes always involve (among other things) a conflict between Hisao and the chosen heroine, and the outcome mostly depends on how, if at all, they manage to handle it. This happens here too, to an extent, but 80% of the conflict is still just between Suzu and none other than
herself. Hisao is mostly just there to act as a good, supportive boyfriend. I can understand why, I mean, Suzu has enough problems already, if they had to tackle Hisao's too they probably couldn't take it - but it does strain the percieved credibility of their relationship, the feeling that they can both add something to the whole. Strangely enough, while Suzu seems to want to avoid Hisao treating her like she's made of glass, she continually reinforces the idea that she can't go on without him. But what is she giving him in return? I don't see it.
So yeah, I have to say, Act 3 disappointed me.
I believe it hit me especially hard because I enjoyed the first two acts so much, and I can't put my head around things suddenly taking such a huge turn for the worse. I can only hope that my worries prove to be foolish nonsense in Act 4, but before I find out, I think I'll need to get some rest.