Yeah the Raidou games are interesting. While they are not exactly stellar action-rpgs, the whole detective aspect of the game is actually pretty cool since you use demons to do your leg work for you. The time period stuff also makes the games really interesting as the Taisho Era was a pretty cool one for Japan (it's like their Roaring 20s but combine it with trying to "Westernize") so the game has a real fresh design that separates it from the more done to death high school and 80s cyberpunk post-apocalypse settings the series tends to gravitate to.