However, Kaigaku betrays his former master and the Demon Slayers, and aligns with the demons, being made Upper Rank 6 during the events of the Infinity Castle, replacing the forme ...

Featured during the Demon Slayer: Swordsmith Village arc, Gyokko was the Upper-Rank Five demon from the Twelve Kizuki. After watching his fight with ... power and a unique Blood Demon Art.