The action story is set in Edo-era Tokyo in the early 1700s. The eighth shogun Tokugawa Yoshimune ordered boxes to be installed so commoners can submit their thoughts. After hearing their voices, the shogun creates a new magistrate unit — Mushibugyou — to protect the people in the heart of the city. Each member is a specialist with unique fighting skills.
The Insect Magistrate is confused by Jinbei's actions; is he friend or foe? Jinbei continues his fight against the hunters but the difference in skill is obvious.
The Insect Magistrate is in danger and all military groups must set out! But as the groups set a bug attacks Edo and Jinbei must decide to save the town or follow orders.
Teamed up Hibachi for his first assignment, he is regulated to the sidelines, forbidden to draw his sword.
While on patrol, Jinbei can't understand why the people of Edo hate Shungiku. When Shungiku is accused of murder, Jinbei stands by his new sword master.
Tsukishima runs around preparing for the famous Ryogoku River Opening, as everyone else evacuates for the best seat for Summer War.
The Insect Magistrate heads to Kishuu to recover her lost powers. Oooka Tadasuke, Edo's smartest man, accompanies her as her guard. Jinbei goes as well, but Oooka is upset by his failings as a Samurai. And then Nezu Jinpachi, one of the 10 Crucifix Insects, appears!
Jinbei is chased and captured by the people of Kishuu at the order of Sanada Yukimura. The village of Iwamatsu, where he is kept, is attacked by bandits, and he wins the hearts of the people by chasing them off. However, there is only a brief moment of rest. Two of the ten crucifix insects, the Rokurou Combo, take a girl hostage!
Jinbei heads to meet the lord of Kishuu, but he finds Hibachi instead. The party meets with the rest of the City Patrol group and enjoys a brief rest. But the time limit is drawing nigh, and just when the Ten Crucifix Insects attack the people of Kishuu...
A request from Minster Mizuno Saneyoshi has requested for Mugai to perform an insect extermination. Mugai has picked Jinbei to accompany him, but won't explain why...
Cornered by Sougan, the strongest of the Insect Hunters, attacks the Insect Magistrate but seconds before death an unfamiliar Jinbei awakens.
Sanada Yukimura's 10 Crucifix Insects attack one village after another. The Insect Magistrate rushes to Edo Castle, where she discovers a secret in Nagatomimaru's room. And the secret past of Jinbei's father Genjuro, and how he met Jinbei's mother, is revealed!
A former team member of Mugai has been tasked to gather information on the Insect Magistrate, she attaches to Jinbei as a source of info, learning this Mugai offers her some advice.
The second battle of Wakayama Castle is against Kirigakure Saizou, the strongest of the Ten Crucifix Insects, who is a master of strange techniques. Hibachi is dazzled and bewildered by illusions of her past.
A masked figure is stalking the headquarters of the Insect Brigade. What does he want and why does he know so much about their inner workings?
A new half insect half man has appeared in Edo looking for a certain young samurai. As conventional weapons fail to stop him it is up to Jinbei to test his new skills.
The fourth battle of Wakayama Castle is between Ichinotani Tenma and Anayama Kosuke. Anayama says "Justice" a lot. He attacks Tenma with his warped sense of justice. A badly wounded Tenma continues to fight, hoping for just one thing: to meet the father and mother he's never seen.
Jinbei's flower team advances steadily. Meanwhile the snow team, the Magistrate's party, reaches the eternal well. Kirigakure Saizou then reveals his true self and begins a one on one fight with Mugai.
The battle with the Ten Crucifix Insects begins! The first round is Tsukishima Jinbei vs. Nedzu Jinpachi. As soon a the battle begins Jinbei is drawn into the castle moat, and forced to fight underwater at a huge disadvantage. Does Jinbei have a way to win? And what is the true form of the Ten Crucifix Insects!?
The Miyoshi brothers have powerful regenerative capabilities. They say that taking life is offering salvation, and in them Shungiku sees his own younger self. Oooka, who knows the old Shungiku, is doubtful he can win the battle.
The youngest member of the group, Ichinotani Tenma and his shikigami are very powerful, but even he has a fatal weakness that Jinbei is determined to help him overcome.
Osono the journalist plans to write an expose about the Insect Magistrates and knows she will get her big scoop at the women's bath.
Jinbei has traveled all the way to Edo to join the Insect Magistrate's Office. That is if he can find it before being killed by a Yarougumo.