 If you liked
Yasashii Ryuu no Koroshikata
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 ...then you might like
Akatsuki no Yona
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These fantasy stories have mythical dragons coming to aide a fighter, swordsmen and battles. In each there is a vow from the past of a dragon coming to the aide of the nobles. The art in each story is good and sets the tone of the mythical fantasies well. They both have handsome heroes. A difference is that Yasashii Ryuu is a shounen-ai - while Akatsuki no Yona is a shoujo but I think that both are a treat to fans of fantasy art.