The Phantom King

The Phantom King is a manga by Im Dal Young. It is based on a light novel series by the same name.

11 years ago, Eun Sung-min was one of the few survivors from a village that experienced the "Evil Phenomenon". He and his maid were saved by the mysterious Phantom King and his group, Phantom. Now the Special Environmental Protection Agency is searching for the answers to what happened on that fateful day, and how to combat the "Evil Spirits" that caused such mayhem.

This manga contains the following tropes:

 * Ninja Maid: One of the major protagonists is this.