I'm gonna be honest, if I had had to pee as long as Yuka has, and I found a bathroom but all the stalls were occupied by hanged corpses, I'd probably just push one out of the way and go, and be creeped out and horrifed later.

My head canon is that Naomi secretly also loved Seiko and her dreaming mind created the way she wishes Seiko's death had gone, where they shared one kiss before the end. I'm not sure if that makes it more or less sad...