The Untold Scenario Behind the Birth of the Japanese Nation In the 3rd century, Queen Himiko unified the Wa kingdom under Yamatai, and in the 5th century, the “Five Kings of Wa” paid tribute to Chinese dynasties. Yet the century between them—the 4th century—remains shrouded in mystery, a period historians often call “the missing century” of Japanese history. What really happened in the Japanese archipelago during this enigmatic hundred years? This book challenges the long-accepted “Horse-Rider Theory” and instead presents a bold narrative of state formation led by seafaring peoples who freely crossed the Korea Strait—an oceanic clan the author calls the Watatsumi Tribe, or “Sea Deity Clan.” At the center of this story is Emperor Ojin (Homudawake), whose life becomes the thread that weaves together this reimagined history. Grounded in historical evidence yet written with a vivid sense of drama, the book portrays the conflicts, choices, and ambitions of ancient people. As readers progress through the narrative, they are ultimately drawn back to a fundamental question: How was the nation of Japan born?