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Second place went to Mr Andoh's Pennine Diary: Memoirs of a Japanese Chicken Sexer in 1935 Hebden Bridge. Third was The Great Singapore Penis Panic and the Future of American Mass Hysteria.
The Diagram Prize is an annual award run by The Bookseller and decided by a public vote on the magazine's website.
Horace Bent, the prize's custodian, said: "It appears that this year's prize will go down in history as a blue year."
Horace Bent, the prize's custodian, said: "It appears that this year's prize will go down in history as a blue year."