While investigating the mystery of the black kakugane, Kazuki, Tokiko and Gouta unexpectedly meet up with Alexandria and Victoria, the wife and daughter of the traitorous Victor. Alexandria and Victoria explain that a cure for the effects of the black kakugane exists, but it comes with a steep price. Now Kazuki faces a grave choice: Can he afford to pay...or will he find that he can't afford not to?
- Chapter 74: The Two Final Battles
- Chapter 75: Infiltrating Newton Apple Academy for Girls
- Chapter 76: Secret of the Mask
- Chapter 77: The Great Battle
- Chapter 78: Requires a Decision
- Last Chapter: Boy Meets Battle Girl
- Buso Renkin Finale