In "The Story of the Man Who Did Not Wish to Die" by Yei Theodora Ozaki, what is Sentaro's expectation of the country of Perpetual Life?

In the Japanese fairy tale "The Man Who Did Not Wish to Die" by Yei Theodora Ozaki, a man named Sentaro is abhorred by the thought of sickness and death and decides that he wants to live a healthy lifetime of at least five or six hundred years. He recalls stories of the past about longevity, in particular that of Shin-no-Shiko—who sent a courtier named Jofuku off to a faraway land in search of the Elixir of Life. The courtier set out in a ship laden with treasure but never returned. On Mount Fuji, though, he is worshipped as a god.
Sentaro determines to find the hermits on Mount Fuji who keep this Elixir of Life. He locates the shrine of Jofuku, prays for seven days, and has a vision of Jofuku, who scolds him for living an idle and comfortable life but says he will take him to the country of Perpetual Life where people live forever. A crane made of paper carries him on a days-long journey of thousands of miles until he arrives at his destination.
Sentaro has no expectation at first but is merely curious about what this country might be like. Since the people and the land seem prosperous, he decides that it will be a good place to live. His expectation, therefore, is that he will be comfortable and satisfied there, and he will be happy to live there—forever free from sickness and death.
However, in time, Sentaro learns that the inhabitants of the country of Perpetual Life desire death so that they might be able to enjoy the bliss of paradise. Although he had wanted to escape death, the people of this land long for it. At first he enjoys his long life, but then he grows tired of it. He attempts to escape on the paper crane, almost dies, and then wakes up to realize that he is still in Jofuku's temple and his journey has all been a dream. He learns to be content with his life and the death he will face at the end of it.
In summary, at first Sentaro expects to be happy in the country of Perpetual Life, but then he learns that it does not satisfy him.