Sadly, I got into Nightmare via the anime Death Note. I say that's sad, since I hadn't heard of them before that.
Their opening and closing songs for it didn't grab me right away, however, I was looking for a new band, and basically had money to spend so I decided to get this. (I decided on this version since I'm a sucker for limited edition stuff, and figured even if I didn't like them I could one day sell it.)
Turns out, I fell in love with the damn thing. I don't have any other band on my iTunes that sounds quite like them. (Noting this right here: I usually don't bother to learn the names of people in bands I like, for some odd reason or another.) The vocalist... has a great voice, I don't speak Japanese (although I'd love to learn to, just to understand some of my music, although I don't listen to just j-pop/j-rock.) And everyone in the band just knows how to play their instruments damn well (look up some of their live videos on YouTube, they do a fantastic job.)
My favorite song on this album has got to be BOYS BE SUSPICIOUS which is the opening song (and the one I'm listening to right this moment.) I've listened to this song so much I could almost lip sync it (and as I stated before, I can't speak Japanese, so I've listened to it a lot.) While my second and third favorites are Criminal baby and Alice, and my fourth being Black Sick Spider.
There are two tracks on here I'll admit I don't like, crevasse and the FOOL. I just don't like them. I don't hate them, but I don't like them.
All in all, I'd say if you enjoy nice music, j-pop/j-rock or just want a new band to listen to you should pick up this album. Although, of course, you don't have to do what I did and get this version (even though it comes with a nice photo album full of pretty pictures.)