So I was browsing manga at Borders the other day and I see this one manga that looked pretty promising. The premise of it was there was this guy who was condemned in Hell for basically being remorselessly evil. Then one day this demon decides if this guy can kill 105 physical representations of sin, then he may have his freedom from Hell. I may have a few of the details wrong, but that is the gist of it.

The problem is, I cannot for the life of me remember what it is called.

Can somebody help jog the old memory bank? Thanks!