Yukio wants to know the secret of their birth while Rin believes there is no need to know. As their ideas clash, Rin and the others head to Kyoto to attend the wedding of Juzo Shima and Mamushi Hojo. 

Overwhelmed by his conflicting emotions, Yukio takes drastic measures, but Satan blocks him. After hearing from Shiemi about Yukio, Rin rushes out of the dorm to search for him. Assiah, the material world, is thrown into chaos as demons become more active. Mephisto is summoned to the prime minister's office and attends a press conference with the prime minister and all relevant parties to announce the existence of demons, which has never been publicly acknowledged until now. But who appears there is...