Toaru Kagaku no Accelerator Manga Volume 04

Toaru Kagaku no Accelerator Manga Volume 4 is the fourth volume of the Toaru Kagaku no Accelerator manga series that was released on October 27th, 2015. It deals with the fourth part of the Necromancer Arc.

Publisher's Summary
It's really cool when "villains" devour "villains".

The Scavengers from the Dark Side of Academy City has worn down both Huotou and Esther. But then, he appeared.... the strongest and worst one!