Invaders of the Rokujouma!? Volume 34 by Takehaya

Now that Koutarou and the girls know the remnants of Vandarion’s faction are holding out on Earth, they’ll have to dig deep for a new fight on the home front. Ralgwin is patient and strategic compared to his uncle, and he’s more than prepared to play the long game. He’s already managed to get his hands on a piece of spiritual energy technology that puts him one step closer to the power of Koutarou and company, but he’s willing to play dirty to level the playing field... meaning Ruth’s in danger when a mysterious assassin appears.