What do you think is the most crucial scene in this novel? How does it compare to the other scenes? In my opinion, I think that the most crucial scene was Toru and Naoko having sex in her apartment. If that had never happened, Naoko wouldn't have gone to the hostel and Toru would continue living his life in university.
This answer contains spoilers… (view spoiler)[I agree that it is probably the most crucial scene, but it is not the most memorable to me. The scenes that seem to linger with me are the image of Naoko sitting bathed in moonlight at the foot of the sofa while Toru watches her, pretending to sleep, or Midori spread eagled before her Dads memorial, or Toru sitting with Midori' s father... (hide spoiler)]