"Blue Morning" is a historical yaoi manga set in the late Meiji era of Japan, written and illustrated by Shoko Hidaka. The story centers on the complex relationship between Akihito Kuze, the young heir to the aristocratic Kuze family, and Tomoyuki Katsuragi, the family's steward. Akihito, orphaned at a young age, is raised under the strict and often cold guidance of Katsuragi, who is deeply loyal to the Kuze family and its legacy. Despite his privileged position, Akihito feels isolated and struggles with the weight of his responsibilities as the future head of the household.

Katsuragi, a man of unwavering discipline and ambition, is determined to restore the Kuze family's former glory, which has been diminished due to political and financial challenges. His methods are often manipulative and calculated, creating a tense dynamic between him and Akihito. As Akihito grows older, he becomes increasingly aware of Katsuragi's influence over his life and the family's affairs, leading to a mix of resentment, dependence, and a deepening emotional connection.

The narrative explores themes of power, loyalty, and forbidden love, as Akihito and Katsuragi navigate their complicated bond. Katsuragi's past is gradually revealed, shedding light on his motivations and the sacrifices he has made for the Kuze family. The story also delves into the political and social changes of the Meiji era, with the Kuze family's struggles reflecting the broader challenges faced by the aristocracy during Japan's rapid modernization.

Secondary characters, such as Akihito's childhood friend and potential romantic rival, add layers to the story, further complicating the relationships and power dynamics. The manga balances emotional intensity with historical detail, creating a compelling exploration of love and duty in a time of societal upheaval.