English version: https://www.pixiv.net/en/artworks/107861464
Japanese version: https://www.pixiv.net/en/artworks/100167070

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What do you know about Futanari? This is a book of discussion and commentary on Futanari, with illustrations to inspire those who have "heard of it but don't know much about it" and those who "love it and want to know more about it" to learn and learn about various Futanari topics! Etymology, thesaurus, misuse, language, worldview, examples of works, expressions, etc... I discuss and explain about Futanari from various perspectives. The book not only provides knowledge for the reader, but also focuses on the creator and includes ideas for drawing the Futanari in a more attractive way!