a masterpiece of a game, as well as one giant WTF moment.
Gameplay- The story isn't the only thing that's odd about Killer7. The movement in Killer7 is done on "rails", now let me explain what this means; movement is done with the X button, there is always a set path that you have to follow, but there are "junctions" (areas where you can turn around) all over the place, the closest thing the movement resembles are (if you remember them) those 1st person RPGs where you navigate through a maze (for example, a Bard's Tale). the way you attack is by holding the R1 (ala, RE style) then it goes into 1st person, and then you can shoot at your enemies (The Heaven Smile). if you shoot certain weak spots on the Heaven Smile you can collect "blood" which is the currency of Killer7, with blood you can upgrade your characters, and as you upgrade your characters you will also earn new skills.
if you're a fan of deep, complex stories, as well as interesting characters, and noire-esque media you should definitely play Killer7