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.

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.

Cornered by Sougan, the strongest of the Insect Hunters, attacks the Insect Magistrate but seconds before death an unfamiliar Jinbei awakens.

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.

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.

The battle for Wakayama castle continues! Muagi battles Saizou while the rest of the Magistrate's fights the last of the crucifix insects, and Jinbei attacks Yukimura. The Magistrate plunges herself into the Eternal Well, and her mysterious past is revealed.

The well gives the Magistrate back her power and she transforms into Shiroageha, but her memories are lost. She attacks Jinbei, and the power of the well makes Sanada much stronger. Jinbei, who swore to fight until he dies, is faced with his last enemy. The final battle begins!