The episode is praised for its darker atmosphere, specifically the creepy nature of Todo's betrayal and the raw emotional weight of the Exwires' distrust toward Rin.
Many viewers felt this was the episode where the season finally "clicked" after a somewhat slow start. Ao no Exorcist: Kyoto Fujouou-hen Episode 4
The mystery of who stole the "Right Eye" of the Impure King is finally solved. , a veteran Exorcist and former teacher, is revealed as the traitor. He has not only defected but has also begun consuming demons to gain power, showing a grotesque transformation that highlights his obsession with strength. 2. Rin’s Struggle for Control The episode is praised for its darker atmosphere,
Rin spends much of the episode training with to control his blue flames. He needs to manifest them without losing his mind or causing collateral damage. Just as he starts to show progress, the stress of the temple's suspicion and the unfolding chaos causes him to nearly lose control in front of the others, reigniting their fear of him. 3. Family Tension & The Suguro Conflict , a veteran Exorcist and former teacher, is
Reviewers often highlight the animation during Rin’s flame practice, which effectively conveys the destructive potential of his powers.