 If you liked
Arslan Senki
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 ...then you might like
Nige Jouzu no Wakagimi
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Both series have a similar starting point. The main character is the young heir to the throne (or similar) and is presented as a weak warrior with no talent at first. The initial conflict is very similar as well: the destruction/occupation of their homelands. Both characters encounter a group of people who become their comrades. Finally, Arslan and Tokiyuki are similar in their age as well.