The protagonist of this work uses the word "hatless" to describe nakedness, and his sexual activity results in an abnormal pregnancy.  One character in this work lost a husband and small daughter to a natural disaster, and at the novel's end, the protagonist becomes engrossed with a water trap that he set up to ensnare a crow.  The protagonist rides a train to the ocean on an excursion to collect insects as the novel opens, and in the climactic scene he is offered freedom in exchange for having 
The protagonist of this work uses the word "hatless" to describe nakedness, and his sexual activity results in an abnormal pregnancy.  One character in this work lost a husband and small daughter to a natural disaster, and at the novel's end, the protagonist becomes engrossed with a water trap that he set up to ensnare a crow.  The protagonist rides a train to the ocean on an excursion to collect insects as the novel opens, and in the climactic scene he is offered freedom in exchange for having sex in public.  The central character climbs a rope ladder to a house in a depression, only to find he cannot escape and has been forced into a life of shoveling sand.  FTP, name this novel featuring Niki Jumpei and the nameless title female, a retelling of the Sisyphus story by Kobo Abe.
The protagonist of this work uses the word "hatless" to describe nakedness, and his sexual activity results in an abnormal pregnancy.  
The {Woman in the Dunes} or {Suna no onna} (3) [AH]