Question: What district of Japan does Toyoko Tokiwa cover in his book about Yokohama after World War 2?
Sentence (from "Toyoko Tokiwa"): Toyoko Tokiwa (常盤 とよ子 , Tokiwa Toyoko , 1930) is a Japanese photographer best known for her 1957 book of text and photographs "Kiken na Adabana" (危険な毒花 ), and particularly for its portrayal of the red-light district of post-occupation Yokohama, with US servicemen.
Relevant evidence: Yes