Under the supervision of Shura Kirigakure, Rin is working on manipulating his blue flames when word comes of a serious theft.
Rin joins the reinforcement unit at the Kyoto field office, where the Right Eye of the Impure King is hidden.
Bon, Konekomaru and Shiemi try to deal with their responses to recent events; Yaozo summons the family heads of the Myoda sect; as they discuss the incident with the Right Eye, the group begins to question the actions of head priest Tatsuma.
Without high priest Tatsuma in attendance, the general meeting falls into chaos and ends without a conclusion; as Suguro resolves to find and question his father, he witnesses someone sneaking into the Kyoto field office.
While confronting Ryuji after the theft of the Right Eye of the Impure King, Rin loses control of his blue flames in front of the gathered exorcists, and in all of the commotion, Tatsuma slips Shura a letter addressed to Rin.
Tatsuma's letter reveals the circumstances of how Rin got the sword.
Following the revival of the Impure King, Tatsuma asks Rin to use the Koma sword to fight, but the question remains if that will even be possible; to make matters worse, Mephisto suddenly appears with the news that Rin has been sentenced to death.
Miasma spreads through the streets as the exorcists begin to counter the Impure King's growth; Rin leaves with the other students to find Tatsuma; Yukio is on the front lines, unaware his brother has left his cell, when he notices something strange.
Yukio is shaken as Todo tells him to admit his true feelings; Yukio reflects on the thoughts he's had since an early age; Suguro has inherited the Gouha-en, and with it, he and Rin head to the sporangium.
The sporangium has finally burst, revealing the Impure King. Assaulted by the miasma, Suguro barely maintains the barrier.
Rin finally manages to draw the demon sword, but there doesn't seem to be a way to stop the Impure King's overwhelming growth.
The sight of a blue flame burning in the night sky is reminiscent of Blue Night, but has brought about a completely different result.