Matsuda Shota is the lone policeman for this secret group of illegal immigrants who live in Tokyo. Dias Police is more like a private detective show about immigrants and the show is surprisingly sympathetic to their plight with Matsuda's character talking about how Japan hardly recognises any refugees.
My problem with Dias Police is tone. It deals with some dark issues like organ and children selling to suicide by tongue biting but it doesn't go for realism at all and is closer to a afternoon cop dorama or even a tokusatsu show rather than a WOWOW one. It tries to be light hearted but I never even smirked once.
I just find the tone all over the place and nothing clicked with me. The only reason I lasted 4 episodes is that they were pretty short. Then I saw the preview for episode 5 and Kaho is in it! Looks like I'll be staying on another 2 episodes. Otherwise, meh. Nothing to see here.