The Cycle of Rebirth is the 10th episode of the second season of the Nurarihyon no Mago anime series.
The group arrived at the Nijō Castle. They where been stopped by the two guards Gaitarō and Gaijirō. When one of them starts to attack Rikuo and sees that Rikuo disappears softly. Rikuo appeared and attacked them and kicks them into the water. Rikuo and his group then has entered the Nijō Castle. Rikuo then tells the Kyōto Yōkai about what had happened 400 years ago. He then warns them that they mustn't get in his way, and threatens them saying that he will send them straight into the Sanzu River.