"Dainippon Tengutou Ekotoba" is a historical fantasy manga set in an alternate version of Japan during the Meiji Restoration era, blending supernatural elements with political intrigue. The story revolves around the Tengu, mythical bird-like creatures from Japanese folklore, who are depicted as a marginalized group struggling for survival and recognition in a rapidly modernizing society. The central conflict arises from the tension between the Tengu and the human government, which seeks to suppress their existence and exploit their powers for nationalistic purposes.

The protagonist, a young Tengu named Kujaku, becomes a key figure in this struggle. Kujaku possesses a rare and powerful ability that makes him a target for both the human authorities and rival factions within the Tengu community. As he navigates this dangerous landscape, Kujaku forms alliances with other Tengu and sympathetic humans, including a former samurai named Shougo, who becomes his mentor and protector. Together, they work to uncover the truth behind the government's plans and fight for the Tengu's right to coexist with humans.

The narrative explores themes of identity, oppression, and resistance, as the Tengu face discrimination and violence while attempting to preserve their culture and autonomy. The human government, led by a shadowy organization known as the Black Tortoise Society, employs ruthless tactics to control the Tengu, including experimentation and forced assimilation. Kujaku's journey is marked by personal growth, as he grapples with his role as a leader and the moral complexities of his actions.

Supporting characters include other Tengu with unique abilities and backgrounds, such as the fierce warrior Suzaku and the enigmatic sage Byakko, who provide depth to the Tengu society and its internal conflicts. The human characters, including government officials and revolutionaries, add layers of political intrigue and moral ambiguity to the story. The manga balances action-packed sequences with moments of introspection, creating a rich narrative that delves into the struggles of both individuals and communities in a time of upheaval.