 If you liked
Kenpuu Denki Berserk
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 ...then you might like
Sword Art Online
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-Both feature a very strong swordsman as the main protagonist
-Both Guts and Kirito are known as "Black Swordsman"
-Both have great antagonists Griffith and Akihiko Kayaba, who are very similar (motives, objectives and personality)
-Both have a bit of romance
-Both have the best anime openings of all time
-They board the same themes (not all of them, just some)