It's an anime from 2010 about two angels named Panty and Stocking (bio writer just doesn't know how to spell) who were kicked out of heaven for bad behavior. They team up with a black priest named Garterbelt and fight monsters in order to get back on heaven's good side.

It's pretty good but not for everyone. Lots of crude and offensive humor, the creators literally came up with the plots while drunk. It's unique in the way that they took a ton of inspiration from western media, the art style straight up looks like Powerpuff Girls.

I would say that I'm surprised this girl is into it but she's also got the manga Killing Stalking in her interests, something else that Tumblr hates.