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The young Chu Mu was plotted against and implanted with the White Nightmare by Xia Guanghan, and was taken to the Green Nightmare Island. Under the control of the Nightmare Palace, he and his soul pet Mo Xie were forced to fight bloody battles for survival, and eventually became the youngest king of the Prison Island. He became famous in front of the princess and was promoted to the Nightmare Master of Henghai. Chu Mu had some freedom and immediately returned to Gangluo City to save his family from danger. At the same time, Mo Xie's talent attracted Xia Guanghan's covetousness. Chu Mu fought again, and after a narrow victory, he was saved by his mother whom he had not seen for many years... (Source: Bilibili, translated)

Unlike his twin brother, Yukio, Rin Okumura never wished to know about their parents and the circumstances surrounding his own birth. Yet the master of time, Mephisto Pheles, gives Rin a key that transports him 40 years into the past when his late mother, Yuri Frederick Egin, was merely a child. With Mephisto's guidance, Rin leaps through the years of Yuri's childhood and her adolescence as an exorcist-in-training. Early on, Yuri meets Shirou Fujimoto, Rin and Yukio's adoptive father. As Rin follows Yuri and Shirou's lives, he witnesses firsthand the initial appearances of Satan, his true father, and the horrors unfolding at the True Cross Order's special Section 13. Yuri's unique connection to Satan eventually leads Rin to the truth behind the most horrific event in exorcist history and the day he and Yukio were born—the Blue Night.

Special episode of sent to buyers of collector's edition of the Blu-ray.