This is a visual novel detective game, being a port of the PS2 game of the same name (there's a sequel on the PSP as well, so I'm expecting to see that on the DS in time), whereby you play a police officer across three cases that involve a lot of supernatural situations and whatnot. Each game in the Hayarigami series has two ways to solve the mysteries - either through spiritual or scientific methods, offering two different approaches for each case.
As for the possibility of a Western release, there isn't one.