Ronin is about a young girl, known as the "Rōnin", which has lost her father for unknown reasons and the only thing she has left is a photo of five former associates of her father, responsible for his death. The Rōnin is now in charge of self-justice by taking revenge upon those five persons, one at a time.

Ronin is about a young girl, known as the "Rōnin", which has lost her father for unknown reasons and the only thing she has left is a photo of five former associates of her father, responsible for his death. The Rōnin is now in charge of self-justice by taking revenge upon those five persons, one at a time.