
The narrator finds himself completely in love with Yumiyoshi (the receptionists) and believes that she is the only thing that can tie him down to the real world. If he doesn't get this relationship he will join the ghosts in the death-chamber, because there is still one more skeleton left.
They sleep together for the first time and it seems to be the final step to bring him back to reality.
"I've made it back to reality-that's the important thing. I've come full circle, and I'm still on my feet dancing."
That night he has his final dream of the Dolphin Hotel. Finds himself in the blackness with Yumiyoshi and they go in-search of the Sheep Man's room. When they find it he is nowhere to be found.
"We were at the edge of the world. That is, what the ancients considered the edge of the world, where everything spilled over into nothingness. We were there, the two of us, alone. And all around us, a cold, vast void. We held each other's hand more tightly."
When they eventually let eachother's hand go Yumiyoshi passes through the wall and says the same thing that Kiki told him in the Honolulu room, "Really simple. You can pass right through the wall."
He eventually wakes from this dream, but it does leave me thinking that Yumiyoshi is the sixth skeleton in the death chamber, and that in the end she is an illusion just like Kiki, June, and Mei. Of course, I can't know for sure because the novel ends without tying up all of the still lose connections, but that is my guess. There is something about the narrator that one just knows he isn't going to live happily-ever-after, and that Yuki was right when she said that his connection to the world is through death.