Summary of the first season of the show, as seen from Rikka's perspective with new elements.
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Zatoichi runs afoul of some evil fugitives, working for a corrupt law official.
As a child, Okin the one-armed one-eyed swordswoman was disfigured by Lord Daizen-dayu, who was after her family's most treasured possession, the famed Drenched Swallow sword. As an adult, she has become a skilled swordswoman and lives a carefree life with her adopted family. One day, Okin saves a girl from a group of yakuza, and in doing so, gets involved in a grand conspiracy involving religious leaders, government officials, the yakuza and Lord Daizen-dayu, the man who killed her father and mutilated her body...
The last film in the series brings the tale to the doorstep of Pacific War, with the planning of the bombing of Pearl Harbor dominant in Nakano Spy School.
