ZERO

There's this guy, Saejima Kouga. He's one in a long line of Makai Knights, who just happen to be protectors of Humanity. Fighting these things called "Horror's" he encounters this girl, Mitsuki Kaoru, who gets stained by the blood of a Horror... and it says that anyone who's stained lives for 100 days and then dies a horrible death, so it's his job to kill her to save her from that fate. But he can't. He takes pity on her, and uses her as Horror bait instead... with the intent to clense her somehow. But the show isn't just about them. It's basically just about him fighting Horror'swhich  until Suzumura Rei comes into the picture. He's kinda the anti-hero hero. He's this badass that picks fights with Kouga, tries to kill Kaoru, but watches the fights that Kouga has. 

Later, and I haven't gotten to this part yet, but I saw the Wikipedia thing on it, and it went into spoilers and details... but anyway. From what it says there Rei and Kouga unite against Barago, who killed Rei's adopted father and girlfriend... and from there I stopped reading. lol

It's a pretty wicked show. The series was created by Keita Amemiya (Kamen Rider ZO, Zeiram), and is directed by Makoto Yokoyama (Power Rangers) and Kengo Kaji (Uzumaki). It definately has that Power Rangers feel, but isn't as cheesy. Or stupid. >_> ; It's geared more toward older teens and adults as apposed to a kids show... so it has more blood, violence, and nudity. >_> mermaid chick. lol they showed her boobs.