Ikebukuro West Gate Park, or IWGP for short. It's like a live action anime, but actually good, unlike the goofy live versions of Dragon Ball or Sailor Moon. It's a mystery show that centers around the gangs in that section of Tokyo.
I can't link to anything but small clips I suppose, so here's what people have on youtube, though it's all available on Veoh. It's a really awesome series though so you should all check it out! ^_^