Actually, I didn't really want it at all. I was forced into the situation, and it was either that, or let God take humanity's free will away at best, or kill them all at worst because He wasn't getting his way.

[Here, Kazuya just shrugs. If there had been another choice that had solved all of the problems that had arose and had let him keep his soul, it would have been a far better choice in his eyes.]

Honestly though? I mostly did it to keep the people I love safe. But I guess getting the power to do that was a natural outcome of that desire.