A young female samurai comes upon a dying messenger and agrees to deliver the scroll he was carrying to its destination. However, unbeknownst to her, the scroll is actually a formula for a new kind of gunpowder. An evil clan that is planning to overthrow the Emperor is also after the scroll, and they try to take it from her.

Oichi may have met her match as she vies against the evil beauty that has set her sights on destroying her. She must face numerous other challenges before confronting her greatest rival. While longing to live and love like other women, she realizes that she can never have a normal life, her sword which she holds on to like a security blanket will always come between her and such a life...

Oichi the Blind helps a woman escape the clutches of a high government official to go off with the man she loves. The official puts a reward on her head of fifty gold pieces and soon a menagerie of bounty hunters are after her skin. Three of them band together to accomplish this, one an expert swordsman, another a huge judo master and the third is deadly with a chain. To escape, she heads for the fishing town of Itso but soon comes face to face with Sankuro, the swordsman...

A young girl named Oichi is abandoned by her mother and blinded by a lightning strike. When her guardian is killed, she learns to wield a sword from a traveling ronin. As she develops into a master swordsman, her profession becomes that of a bounty hunter. Many test her sword and many die by her skills. She travels throughout the countryside to seek her mother and her revenge.