"Kabukumon" is a historical fantasy manga set in the Edo period of Japan, blending elements of traditional Japanese theater, supernatural intrigue, and political drama. The narrative centers around Shinjirō, a young man who becomes entangled in the mysterious world of kabuki theater after encountering a troupe known as the Kabukiza. The troupe is led by the enigmatic and charismatic actor, Kikunojō, whose performances are said to possess an otherworldly allure. Shinjirō, initially an outsider, is drawn into the troupe's affairs and discovers that the Kabukiza is no ordinary theater group—it serves as a front for a secret organization that combats supernatural threats plaguing Edo.

The story unfolds as Shinjirō learns that the Kabukiza actors are not merely performers but also skilled warriors who use their theatrical talents to exorcise malevolent spirits known as "ayakashi." These spirits, often born from human emotions and desires, manifest as physical threats to the city. Kikunojō, the troupe's leader, wields a unique ability to channel the power of the spirits through his performances, turning the stage into a battleground. As Shinjirō becomes more involved with the troupe, he begins to uncover his own latent abilities and a deeper connection to the supernatural world.

The plot is driven by episodic encounters with various ayakashi, each tied to a specific human conflict or historical event, while also weaving in an overarching mystery surrounding the origins of the Kabukiza and its members. Kikunojō's past, in particular, is shrouded in secrecy, with hints of a tragic history that fuels his dedication to protecting Edo. The narrative explores themes of identity, sacrifice, and the blurred line between reality and performance, as the characters navigate their dual roles as both entertainers and protectors.

Key characters include Shinjirō, whose growth from a naive outsider to a pivotal member of the troupe forms the emotional core of the story; Kikunojō, whose enigmatic presence and leadership drive much of the plot; and other members of the Kabukiza, each with their own unique abilities and personal struggles. The interplay between the characters' personal arcs and the larger supernatural conflict creates a rich, layered narrative that balances action, drama, and historical intrigue. The manga's depiction of kabuki theater is both a central plot device and a cultural backdrop, offering a vivid portrayal of Edo-period Japan infused with fantastical elements.