Hey hello, I wanted to share some of my headcanon for a while too, so it goes. I hope it's not repeated, I haven't read the entire post yet, sine I am new and everything:
- Yuuko is obviously Kenji's ex-girlfriend, and they come back after the game, maybe as friends, maybe as couple, depending on Hisao's advices (how close are they, a thing it changes depending of the route you're on).
- Rin's route or Hanako's route are the "official" routes, I mean, the routes that Hisao would get if we were not guiding him (the reasons are basically that he's very closed in himself while he's in the hospital, and that he likes to read books and spending time in the library.)
- Rin's bad ending end actually ends up in the same place as Rin's good ending. Maybe with some diferences, though. It's not only that in both endings we have the exact same discussion but in different places (that's quite a bit for foreshadowing for me already) but what happens in the good ending: Hisao ends up tired of Rin, and they don't talk until she has the art exposition. I think that two or three weeks pass before Rin's exposition, her break-up due to pressure and then the conversation outside the gallery which ends up in Hisao's final choice.
Thinking about it, it would happen the same in Rin's bad ending. Hisao ends up fed with Rin because she's impossible to understand, yes, he doesn't try to understand her, unlike in her good ending, yes... but even with that, he would end up in Rin's exposition anyway. I think this is important, because (in my opinion) this is the place where you see that Rin's behaviour with Hisao during act 3 (and the reason why he gets upset with her in the bad ending) is weird, yes, and treats Hisao pretty bad, but in the art exposition (aka final choice during her route) Hisao sees that she's really like that, and she doesn't want to make people upset but she can't avoid it. In her words, "I don't know what's wrong with me"
and this leads to her good ending.
Quick resume: In Rin's bad ending Hisao would still think about what he did (his time with Iwanako would help about it), go to the exposition (because, even if you are angry with your friend, it's not that you're not going to see something so important for her, especially after how many time Hisao and Rin have been through) which leads to Rin's route final choice, and then to her good (or neutral) ending.
- The reason why Lilly and Shizune "hate" each other is
Lilly's fault. Long story short, Lilly is as dominant as Shizune, but in her own way. When Lilly's comes back to Shizune after the student cou, it does that to help her, sure, but in her own way, and this lead to the discussion we see in act 1.
The difference between Lilly and Shizune is that the last one is deaf-mute and she clearly has some problems with expressing herself that Lilly (as her cousin) should know.
And that's all, for now at least
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P.D. Excuse my english mistakes.