A legendary assassin falls into a coma after shielding his sister from gunfire. He can only awaken when someone directs murderous intent at him, so his sister drags him into battles against dangerous opponents.

Gengo Matsunaga, once known as Phoenix, was the greatest samurai fire-slayer in all of Edo. After leaving fire-slaying, Gengo is approached with an offer from the Shinjo Domain. Encouraged by his wife, Miyuki, he sets out to rebuild a fallen firefighting brigade. Gengo gathers a group of misfits, the Ragged Fire-Slayers, as they investigate mysterious fires started by the arsonist Kitsunebi.