@Mai82Go: I also don't think that "Monster" is like "truth" ("truth" is my favourite Arashi song too, by the way!
).
Well, yes, both are dark songs and show us a more "mature side" of Arashi, but "truth" is a sad, dark and depressive song, while "Monster" - in my eyes - gives you more of a spooky and mysterious feeling (it always makes me think of Halloween).
I like "Monster", but it can't beat "truth"!
And "Troublemaker" is a great song too! I like it very much!