How do you think it ends? Are they alive, or did they die in the lake? I personally think they did die and when they were on the train it was a hint they were going towards a "new life" or *Heaven*. Since you saw that Sora had the bunny ripped up on the bed and there was a broken window when one of the girls looked through it. And when they are on the train, the bunny is in tact. So I think they did drown at the end, even though it tries to pull you away from that when they get a text/email about being overseas blah blah blah.