A woman joins a convent to investigate the suspicious death of her brother but nothing could prepare her for the horror and depravity that takes place behind the convent walls.

The film portrays a satirical view of today's heartless money-oriented society.

One of the nuns at Senjuan is Sister Shunko (Michiyo Yasuda). Unlike the usual nun, however, she often goes out to see the world, being of the opinion that nuns should not lead cloistered lives but should see something of modern life. She makes the acquaintance of a young girl named lkuko (Kayo Mikimoto) and saves her from the advances of a gangster named Goro (lchiro Nakatani). In the meantime she turns down several propositions and, in revenge, one of her admirers denounces her to the Mother Superior (Kuniko Miyake). This lady is of liberal views, however, and refuses to do anything about it. Then Shunko is visited by Goro's gang boss who wants lkuko back and says he will blackmail Shunko unless she agrees.

Zatoichi runs afoul of some evil fugitives, working for a corrupt law official.

Two devious retainers are competing to take control of a fief when the current Lord dies, but involving Kyoshiro in the conflict against his will is the textbook example of a bad idea - especially when the collateral damage starts to tick him off.