In the era of the twelfth Shogun, Tokugawa Ieyoshi, a notorious bandit known as "Shippu" (or "Swift Wind") emerged in Edo. Shippu would send a warning message called the "Thief's Summons" before striking, yet despite the magistrate's desperate search efforts, they couldn't find any leads. One day, a summons was shot into the residence of Ono Ryusai, who was leading a peaceful retirement life with his two concubines, O-Ran and O-Koshi. With the summons, various individuals including O-Ran's brother Itami Shigoshiro, the master of the Muso-ryu dojo, vigilante Mankichiro, rope expert Gohei, and Den'ichi from Kuromon Town were assigned to monitor the situation. However, while they were distracted by a neighboring fire, a chest containing a thousand ryo was stolen, and O-Koshi was killed.

Watanabe Kazuma and Kawai Matagorō from the Bizen Okayama Ikeda clan were close friends, but they inevitably became enemies after Matagorō killed Kazuma's younger brother, Gentayū, and fled. Seeking assistance, Kazuma asked his brother-in-law, Araki Mataemon, for help, but Mataemon refused, saying that it was against the code for a brother to avenge another brother's death. On the other hand, the lord of the clan, Ikeda Tadao, ordered a search for Matagorō, who was found to be sheltered by the Hatamoto, including Andō Jiemon, in Edo. Tadao was furious but unable to act. Matagorō, in Edo, came to regret his birth as a samurai. He met and fell in love with Okō, a bathhouse maid. As the discord between the Hatamoto and the Ikeda clan deepened, Tadao died of illness. Seizing the opportunity to ease the conflict, the shogunate ordered the Ikeda clan to be succeeded by the young lord Katsugorō and to relocate to the Ikeda clan of Inshū Tottori. Meanwhile, Matagorō was exiled from Edo.