Sometimes, we get a glimpse of something, and we just have to get an answer. If you're a fan of Kamisama Kiss (Kanmisama Hajimemashita), then you probably Googled you head off when you saw a live action video playing during the credits of Episode 11, "The Familiar Goes Into Town" instead of the usual scene recap.
The video turns out to be the music video for the Kamisama Kiss opening theme. "Kamisama Hajimemashita" has proven to catch on with a lot of people because it's made it to the top 20 on the Oricon singles chart this week, right at the number 20 spot. Oricon is similar to the Billboard charts, only reflecting on songs popular in Japan.
Here is the music video for "Kamisama Hajimemashita" by Hanae