
Sonoko
The young woman Kochan courts, whose genuine affection becomes his strongest test of a conventional future.
The book

Who they are in the book
Spoiler-freeSonoko is Kusano's sister and the young woman Kochan nearly marries. Her gentleness and affection matter to him, but they cannot create the sexual desire he is trying to prove.
She represents a recognizable future of courtship, marriage, and social acceptance while remaining a person whose feelings are affected by Kochan's experiment.
How the book draws them
- PeriodHer neat 1940s dress places her within wartime and postwar Japan.
- MannerA soft, open expression contrasts with Kochan's guarded intensity.
- RelationshipHer attachment to Kochan is emotionally sincere.
- Social meaningMarriage to her would confirm the identity Kochan hopes to perform.
- Dramatic functionShe tests whether tenderness can substitute for erotic desire.
- Emotional weightThe ending preserves her importance even as it reveals the limit of the relationship.
Kochan retreats when marriage becomes realistic. Sonoko marries another man, and their postwar meetings cannot resolve his underlying conflict.
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