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What the Book Explores

The Book of Yokai: Mysterious Creatures of Japanese Folklore, authored by Michael Dylan Foster, serves as a rigorous scholarly examination of the vast and varied world of the Japanese supernatural. The term yokai often defies simple translation, encompassing everything from monsters and spirits to uncanny phenomena and strange occurrences. This work examines the historical development of these entities, moving beyond a simple catalog of creatures to explore the psychological and sociological underpinnings of the supernatural in Japanese culture. The author explores how the human impulse to name, categorize, and illustrate the unknown has shaped the Japanese imagination for centuries.

The Taxonomy of the Uncanny

A primary theme of the work is the concept of “yokai-ology” (yokaigaku)—the study of the strange. Foster explores how yokai are not static mythological relics but are dynamic expressions of cultural change. This work examines the transition of the supernatural from the realm of lived, terrifying experience in rural pre-modern Japan to the structured, encyclopedic entries of the Edo period. The author explores how the act of naming a mysterious sound or a strange light in the forest serves a psychological function: by giving the unknown a name and a form, it becomes manageable, if not entirely understood. The work investigates the linguistic roots of these names and how they reflect the specific environments and social anxieties from which they emerged.

From Terror to Toy: The Evolution of the Yokai

The author explores the historical arc of the yokai, tracing their journey from the mononoke of the Heian period to the media icons of contemporary anime and gaming. This work examines the pivotal role of the Edo period (1603–1868) in this evolution, particularly the work of artist Toriyama Sekien, who first illustrated comprehensive catalogs of yokai. The work explores how the commercialization of the supernatural during this era transformed yokai into characters, a process known as kyarakuta-ka. Through this lens, the work investigates how the terrifying became the playful, and how these entities shifted from being sources of genuine dread to objects of intellectual curiosity and entertainment.

The Cultural Geography of the Strange

This work examines the relationship between yokai and the physical landscape of Japan. The author explores how specific entities are tethered to certain topographies—the water-dwelling kappa, the mountain-dwelling tengu, and the domestic zashiki-warashi. By exploring these connections, the work investigates the concept of liminality—the idea that the supernatural thrives at the boundaries between the human world and the wilderness, or between the light of the village and the darkness of the mountain path. The work explores how yokai served as environmental markers, teaching people how to navigate their physical surroundings and respect the boundaries of the natural world.

Historical / Cultural Context

Michael Dylan Foster is a Professor of East Asian Languages and Cultures, and his work matters because it provides a much-needed academic framework for a subject often relegated to the margins of “pop culture” or “superstition.” The Book of Yokai, published in 2015, synthesizes decades of Japanese scholarship (such as the work of folklorist Yanagita Kunio and manga artist Mizuki Shigeru) for an English-speaking audience. It matters as a modern bridge between the traditional folklore studies of the early 20th century and the contemporary global interest in Japanese media.

The work also contextualizes the role of the Meiji Restoration (1868–1912) in the suppression and eventual preservation of yokai. During this period of rapid Westernization and modernization, the Japanese government sought to discourage belief in the supernatural as “unscientific.” However, the author explores how intellectuals like Inoue Enryo used the study of yokai to actually promote rationalism, paradoxically ensuring the survival of these myths by turning them into objects of academic study. This historical tension between the rational and the irrational is a central thread that runs through Foster’s analysis.

Who This Book Is For

This work is structured to appeal to both a specialized academic audience and the culturally curious reader. It is particularly relevant for:

• Students of Folklore and Mythology: Those interested in the mechanisms by which myths are created, categorized, and preserved over time.
• Anthropologists of Japan: Readers seeking a deeper understanding of how the supernatural reflects the changing social structures and environmental values of Japanese society.
• Media Scholars and Enthusiasts: Individuals who wish to understand the folkloric origins of creatures seen in modern media like Pokémon, Studio Ghibli films, or GeGeGe no Kitaro.
• Psychologists: Readers interested in the “psychology of the unknown” and how societies personify their fears and curiosities through narrative.

Further Reading

To further investigate the themes of the Japanese supernatural and the history of its documentation, the following works are recommended:

• The Legends of Tono by Yanagita Kunio: A seminal work of Japanese folklore that served as the foundation for modern yokai studies.
• Kwaidan: Stories and Studies of Strange Things by Lafcadio Hearn: An early Western attempt to capture the atmosphere of Japanese ghost stories.
• Pandemonium and Parade: Japanese Monsters and the Culture of Yokai by Michael Dylan Foster: An earlier, more academic exploration by the same author focusing on the history and culture of the Edo and Meiji periods.
• Yokai Attack!: The Japanese Monster Survival Guide by Hiroko Yoda and Matt Alt: A more informal, visually-driven counterpart to Foster’s academic approach.

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