Where nostalgia expresses a longing to return to time or place when things were good, it is tinged with melancholy, even sadness and anxiety. Natsukashii, on the other hand, is absent this gloominess and suggests something slightly different: a happiness to be remembering a happy memory.
THE WONDER VALLEY DESERT OF GRAM PARSONS
After the killing was done, the deep silence of the desert returned, and I must have fallen back asleep quickly. When I awoke at sunrise, the whole thing seemed like a dream. I went to pee in the outhouse, and when I was done I ventured into the dawn-washed desert, looking for the kill site, for any evidence of what I had heard.