A man who built a leading construction company in Aomori Prefecture passed away from an epidemic and was reborn as the second son of the Nitta clan in the Tamabu Castle (present-day Mutsu City) overlooking Mutsu Bay. In the Sengoku period, he possesses knowledge, wisdom, and the means to achieve his goals. His ambition is to become the ruler of the Sengoku period and create a "Great Japan" that stands above the world. This is a success story of love and ambition of a man born into a small Kokujinshu in the northernmost part of Honshu. Note that while historical research has been conducted, the history of the Ou region in the Sengoku period is unclear, so please forgive any inaccuracies. The story also includes many scenes of domestic affairs such as the development of local products. While written within the technologically possible range of the Sengoku period, please don't scrutinize it too much. The year number is displayed with the Western calendar year. Furigana is occasionally used for names to improve readability. This is the author's first historical novel, so please read it warmly.