"Taishō Roman Oni-san Yameteee—!!" is set in the Taishō era of Japan, a period marked by cultural shifts and modernization. The story revolves around a young woman named Yuzuki, who works as a maid in a wealthy household. Her life takes an unexpected turn when she encounters a mysterious man named Shizuma, who claims to be an oni, a supernatural being from Japanese folklore. Despite his intimidating appearance and demeanor, Shizuma harbors a gentle and protective nature, particularly toward Yuzuki.

The narrative explores the evolving relationship between Yuzuki and Shizuma as they navigate the complexities of their bond. Yuzuki, initially wary of Shizuma’s otherworldly origins, gradually grows to trust him, while Shizuma struggles with his dual identity as both a fearsome oni and a compassionate guardian. Their interactions are shaped by the societal norms and superstitions of the Taishō era, which often cast Shizuma as an outsider and a threat.

As the story progresses, Yuzuki and Shizuma face various challenges, including external threats from those who seek to exploit or destroy Shizuma for his supernatural abilities. The manga delves into themes of acceptance, identity, and the clash between tradition and modernity. Supporting characters, such as Yuzuki’s fellow maids and members of the household, add depth to the narrative, providing both comedic relief and moments of tension.

The Taishō setting is integral to the story, with its blend of Western influences and traditional Japanese aesthetics creating a rich backdrop for the characters’ experiences. The manga balances moments of lightheartedness with emotional depth, as Yuzuki and Shizuma’s relationship evolves from one of uncertainty to mutual understanding and affection. The supernatural elements are interwoven with the historical context, offering a unique perspective on the era’s cultural dynamics.