Volume 1.5

Volume 1.5 is an extra volume that contains omakes. It had two separate release dates in Japan. One with the anime and another separate one.

Summary
TBA

Chapters included

 * Extra Chapter 1: Kill the Blackness
 * Extra Chapter 2: Kill the Mad Swordsman
 * Extra Chapter 3: Kill the Lesser Evil (only in separate release)
 * Extra Chapter 4: Kill the Sorrow (only in separate release)