Momoiro Clover Z's (under the name Momokuro-tei Ichimon) infectious "Nippon Egao Hyakkei (Famous Views on Japan's Smiles)" from Joshiraku is a strong contender for the cult anime theme of the season. To promote the song's September 5th release, the pop girl group appeared in traditional rakugo garb at the appropriately venerable Suzumoto Theater for a performance.
Meanwhile, in an extra degree of recursiveness, the latest episode of the anime goof on Momoiro Clover Z.
Based on a manga by Sayonara Zetsubou-Sensei's Kouji Kumeta with art by Toradora! illustrator Yasu, Joshiraku follows the backstage banter between five female traditional performers.
UPDATE: Nippon Egao Hyakkei is the end theme rather than the opening.