SPOILERS FROM MANGA BELOW!!
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it's been a while since i read the manga so i can't give the exact explanation. the ending of it was totally different and they had characters in it that never showed up in the anime. but in any case, the manga tried to explain how the alter powers were part of some evolutionary change within the humans and S.CRY.ED indicated the completion of that particular change. like, ultimate power or something =P they had it where kazuma can yell "s.cry.ed" and was able to time travel or something. it was crazy, but yet.. lame. he ended up defeating the villain (in the anime, the commander dude of Holy who died) by taking him back into prehistoric era and blowing him up. i dunno, i thought it was lame. no one else read the manga?? help me out here hahah
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END SPOILERS

anyways, if u happen to live in the US, any Barnes and Noble has the s.cry.ed manga series (short, 5 volumes or so) in their manga section if you want to check it out.