Ren'ai Circulation

Ren'ai Circulation (恋愛サーキュレーション lit. Love Circulation) is a song covered by Ayaka Tachikawa.

It was originally sung by the character Nadeko Sengoku (CV: Kana Hanazawa) and used as the fourth opening theme of Bakemonogatari and as the fifth opening theme of Koyomimonogatari.