Seiichi Takayama 
The Master of Ragnarok & Blesser of Einherjar (Manga) Volume 2 

Poor Yuuto just can’t get a break. He’s got girls from every clan flinging themselves at him to establish an alliance, when all he wants to do is get back to his one true love at home. Of course, it would be easier if rival clans weren’t sending spies and loudmouthed warriors his way as well…