 If you liked
Kenpuu Denki Berserk
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 ...then you might like
Kingdom
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Xin is basically the teenage version of Guts except that the entire series focuses heavily on him growing and improving into a future general whereas Guts just did it in a few episodes.
Both are very action packed, deal with the concept of military, strategy and death (Kingdom does a lot more with this) and are just fun to watch.
Both Guts and Shin train really hard with their swords and end up doing major damage on the battlefield
Both encounter palace conspiracies that plunge them into battle
Both Guts and Shin believe in their swords more than anything
Both include smart strategems in order to win battles
Comrades of Guts and Shin put their trust in them to undergo important missions