Adarushan no Hanayome
アダルシャン シリーズ
Alternative
manga
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The small country of Adarshan was conquered by the Castoria Empire. To tie the alliance between the two countries, the victorious shogun, Alexid Deke Adars, was forced into a political marriage with Castoria's sixth imperial princess, Justinia. But she's only 10 years old...! (Source: Aerandria)