Rin would soon learn how to control his powers properly in "Blue Exorcist" season 2 Kyoto Impure King Arc. Rin and the Myoda Sect must destroy the revived Impure King before it corrupts the whole city. While in a pinch, Rin would finally learn how to control his flames.
"Blue Exorcist" season 2, episode 7 featured Rin's escape from prison with the help of his classmates. Shiemi, for one, became Rin's greatest emotional support. However, Rin still can't draw the sword and use Satan's blue flame. It's a sort of a psychological problem due to his fear of hurting someone with his flames. Now he will come to battle as an ordinary high school student carrying a stick.
It was previously reported that the Impure King will be revived by Todo. He tricks one of the Myoda Sect students, Mamushi, in helping him revive the Impure King. About 140 years ago, the Impure King is said to have spread a plague of miasma, decay, and fever which led to the death of over 40,000 people.
Rin and his friends will head to the growing Impure King. Rin and Ryuji will head to the site while the others were left nearby to help other people from evacuating. Meanwhile, Yukio will battle with a powerful Todo who forcibly absorbed the Karura.
In the original manga, it was revealed that Yukio will awaken his demon powers during the battle. He will be pushed to the corner by Todo who will also exploit his emotions by making him hate Rin. Although they are twins, Yukio did not inherit Satan's power and suffered by seeing demons since childhood.
During the fight, Yukio's eyes will change to that of a demon's. At the same time, Rim would try to destroy the Impure King while Ryuji casts a protective spell. Rin would finally learn how to control his powers in "Blue Exorcist" season 2, emitting blue flames to destroy the Impure King and the miasma without hurting anybody.
