For those of you that haven't heard of this game yet, it's an action role playing game for the Vita that looks a little like Monster Hunter. You attack using magic originating from your demonic arm and once you defeat an enemy, you can either sacrifice or save them to gain attack, or defence and HP respectively.
When an ally is defeated, you can also either save or sacrifice them which will either recover their HP at the cost of your own, or kill them and unleash a devastating Magic attack. If they are killed, they won't receive any experience or loot, but can still help in the fight by lowering enemy defence and raising attack of allies.
Check out the trailer, which doesn't show a lot of gameplay till the end but is quite pretty cool: www.youtube.com/watch?v=iInFqPuz898
Here are a couple of video's explaining the basic controls and spells: www.youtube.com/watch?v=jl18nzulmuowww.youtube.com/watch?v=vEWZtbnk_QA
In Japan, they have released a smexy Vita bundle, featuring a limited edition Soul Sacrifice console. No word on a US or EU release: