Board Thread:General Discussion/@comment-5599426-20131106075025/@comment-3497690-20131107043021

Actually, if I'm not mistaken 恭ちゃん/Kyou-chan refers to Kyouichirou, an extremely popular namanushi and occasional utaite/rapper (in fact, he qualifies for the wiki himself). He's friends with a lot of utaite (he's sung covers with the likes of halyosy and 96Neko), including Aho no Sakata - though he pokes fun at Sakatan's singing prowess from time to time.

From what I can gather from the comments, it seems like he linked to the video from somewhere.