there are only 13 episodes...<.< Masami Erie calls her a computer program... actually he calls her Software but that's only partially true...<.<
Did you understand the Kids program or the purpose of the Knights of the eastern calculus, or Masami Eirie's true intentions, or the Psyche processor(it's call something else in the Dub but I dunno how to spell it) or Lain's relation to her family? each plot point is very important and that's just naming a few...<.<
except for Chisa... you can forget about her...<.<
I stayed up many nights unraveling the story and connecting plot points even before I finished the series... This show even got me up in the middle of the night to finish it despite the fact that I had school the next day...<.<