It's a great story, and I've never seen anything like this before, but it seems rushed to the end. The [SPOILER!] second accident just breaks up the whole story, evil Yuna and Ji-hyun don't quite fit in and there's nothing on family, school or Miya at the end. Feels like a good movie, I read it in one go, but it just kind of stops halfway through. I wish there was much more like this.
Edit: I think this changed the way I think about myself forever.
Edit2: Not sure if anyone will still find this, but I may have found the source of the translation and explanation about the "rushed" end: http://walt7.deviantart.com/art/Girl-in-My-dream-episode-52-2-138170582 Again, SPOILER!, this links to the last site of the doujin, description below the image is what I'm talking about.
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Yeah, those wondering about the rushed ending, it is as it seems. There was something wrong with either the author or the artist, but one of them moved on to something else, forcing the other(I believe it was the author) to wrap it up.
To people who don't understand the L4D tickets its a joke, in the game L4D all the levels end in movie like credits saying things like "Bill: as himself" or "Francis: as (Steam/PSN/Gamertag)" but the point is the game is supposed to be like a zombie movie so the tickets are like tickets to watch someone play the game.
Good story, unfortunate that the artist decided to end it early, but at least he illustrated an ending. Speaking of which, the author did eventually post the outline for the actual ending here: https://walt7.deviantart.com/art/GIMD-ENDING-387498588