Shigofumi is basically Jigoku Shoujo, except instead of damning people she gives them mail.
I am actually quite serious.
Personally, I enjoyed it before the incidental lesbianism. By which I mean two girls holding hands. They aren't going to show up in the series ever again, it didn't really do anything for the plot in this episode, and if you were hoping they'd get it on, too bad--not even a kiss.