The blade arts of the "Devil" tasked with striking down evils threatening a peaceful Edo! Heizou Hasegawa, upholding the role of chief officer protecting against crime and arson! In 1783, the heart of the Tenmei era, Hasegawa held the office of chief director of the department charged with sustaining safety in the region, suppressing the most vile of thieves and criminals, an individual largely feared, renowned as Devil Heizou... (Source: MAL News)

The OVA will center on Heizou's character, otherwise known as "Oni no Heizou" (Heizou the Demon); the man feared among the thieves and rogues during the Edo Period. A young man traces the stories surrounding Heizou's early days and their "dogs (spies)" from his admirers Kumehachi, Hikujou and Omasa. After hearing from them, the young man heads for Heizou's private residence in Mejirodai and also learns from his wife Hisae. What is the connection between the young man's motive and Heizou? (Source: MAL News)