Yes, they do.
He starts off liking Riku, but soon he starts to have feelings for Risa.
When they went on a date, Dark asked Risa what she would do if she was to find out that he is a monster. She replies saying that she would still love him. Her response was very important to him and he falls in love with her. And when she was kidnapped, he was furious and didn't show mercy to Argentine (the guy who took her.)
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It's still ongoing, about chapter 73 when Riku questions wether or not Niwa is DaRK
He kisses her in episode 14 of the series while they are on a date.
Dark-Hunter is currently still in development as a television series.
Dark Angel - TV series - ended on 2002-05-03.
Yep! Sure do.