 If you liked
Mugen no Juunin
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 ...then you might like
Shin Angyo Onshi
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Shin Angyo Onshi (SAO) and Blade of the Immortal (BotI) are manga that are set in the past. There is plenty of fighting, suspense, adventure, and a great deal of gore. The main character involves a duo composed of a girl and a man, both parties seeking revenge. These stories aren't for the faint of heart, due to some mature themes like sexual assault or murder. If you like reading fighting manga with a little bit of fantasy, I recommend reading SAO first, and if you enjoy it, it's a given that you'll like BotI too.