Shoukoku no Altair

For generations the Torqye Pashalu and the Balt-Rhein Empire have stood in stern opposition of each other. Then one night, when an Imperial minister is found assassinated, the two nations are plunged into a potentially explosive situation. As the generals of Torqye's council cry for war, Mahmut comes to discover the devious truth behind the assassination. Thus the young pasha's battle for his country and peace and trust in his fellow man begins...
(Source: Kodansha USA)
Note: Includes 5 extra chapters.