Sounds like a good anime series

TOKKO
Check out this description:

Shindou just became a new investigator for Tokki: The Special Mobile Investigation Force. On the day of his graduation, he finally saw the half-naked girl that he had always saw in his dream in real life and finds out that she`s part of Tokko: The Special Public Safety Task Force. Shindou ends up joining Tokko to revenge his parents` death who’s bodies were ripped into pieces…

AniDB page