While most people consider ninjas to be a thing of the past, Rekka Hanabishi disagrees. Although he hails from a family of fireworks makers, he regards himself as a self-proclaimed, modern-day ninja. It sounds like fun, right? Perhaps not. Rekka finds himself in numerous fights because he once boldly declared that if anyone could defeat him, he would become their servant. Then one day, Rekka meets Yanagi Sakoshita, a gentle girl with the ability to heal any wound or injury. Their encounter triggers a chain of events that culminates in a shocking discovery: Rekka is the last surviving member of a legendary ninja clan wiped out centuries ago. Even more astonishing than being a genuine ninja, he also wields the power to control fire. What does this mean for Rekka? Who are these strange people pursuing him and Yanagi? Find out in Rekka no Honoo!