"Oda Cinnamon Nobunaga" is a comedic manga series that reimagines the historical figure Oda Nobunaga, a famed Japanese warlord from the Sengoku period, as a dog in modern-day Japan. After his death in the 16th century, Nobunaga is reincarnated as a Shiba Inu named Cinnamon. Alongside him, other notable historical figures from the same era, such as Takeda Shingen, Uesugi Kenshin, and Date Masamune, are also reborn as dogs. Each retains memories of their past lives, leading to humorous interactions as they navigate their new canine existence.

The narrative centers on Cinnamon and his fellow reincarnated warlords, who now live as pets in various households. Despite their new forms, they continue to exhibit traits and behaviors reminiscent of their human selves, often engaging in playful rivalries and strategic antics. Cinnamon, in particular, maintains his ambitious and cunning nature, striving to assert dominance over the other dogs while adapting to the quirks of modern life. The series juxtaposes their historical personas with their current lives as pets, creating a blend of historical satire and slice-of-life comedy.

The supporting cast includes their human owners, who remain unaware of their pets' true identities. These characters provide a grounding element to the story, as the dogs' interactions with their owners and the modern world highlight the absurdity of their situations. The series explores themes of identity, legacy, and adaptation, using humor to bridge the gap between the past and present. Through its unique premise, "Oda Cinnamon Nobunaga" offers a lighthearted yet insightful take on history, blending historical references with contemporary humor.