Basically... Kanzaki was born in a great, great position. Something about God or something, but basically, she was a very important person to the group she belonged too (her powers are godly too, it seems).
But because of this, people gladly sacrificed themselves to shield Kanzaki from attacks and stuff, which is why, like the anime ONLY hinted, her fortune was their misfortune and how she hated people talking about misfortune or whatever Tsuchimikado said. She gets protected, they die.
So the stupid self-centered dimwit gets it in her head something weird, so she decides to THROW away that position (so people don't have to die) and start protecting people herself.
Good story... Hahahahaha, good to annoy me.
I really, really feel sorry for the people who sacrificed themselves for her. They were protecting her out of their own will for this great person of her position, but SHE couldn't stand other people dying (without thinking about their feelings, and just because she didn't like how people were dying around her, which apparently she thought was something that made them unhappy or something), decides to throw away that position that they worked so hard to protect. Just like that... Their lives wasted.
And so the stupid Messiah Complex girl decided to save people, even giving herself a magician's name that fits her.
Yay~~~ <--sarcasm
Peh...