Panty & Stocking with Garterbelt, High School DxD Recommendations
They are both about a supernatural group. In Panty and Stocking case, they kill ghosts and in DxD they kill fallen angels. They is comedy, ecchi and really likable characters.
So if you like hot angels/demons, softcore porn, strong language and all that kind of stuff, then you should watch Panty & Stocking too.
They don't have that much in common when it comes to the storyline, but they do have the whole fallen angels and demons thing going on, and also the fact that they are using magical weapons and abilities.
The feeling you get from watching HSDxD and Panty & Stocking are pretty much the same exept that Panty & Stocking has more of a comedy wibe, when HSDxD is a bit more " serious" show.