Very few male authors choose women as their main protagonists, especially in a first person narrative. That is, however, not the only aspect of Murakami that sets him apart from just about everyone else.
His particular Twilight-zone universe is comes to its full right in novels, it seems to me, but this novella has the advantage of being enhanced by illustrations of German artist Kat Menschik.
The story is about insomnia. Or rather the loss of the need to sleep. And about love. Or lack of love. Or solitude. Or memories of the past. And a re-evaluation of life.
Or all of the above. (Or, perhaps, none?)