In the heart of the San Fernando Valley, a new kind of danger emerges. Demons, creatures of darkness, begin to appear in the dead of night, terrorizing innocent people. As the familiar rivalry between Miyagi-Do, Eagle Fang, and Cobra Kai intensifies, a new, more dangerous challenge arises: a supernatural force that even the toughest martial artists can’t easily defeat.
Daniel LaRusso and Johnny Lawrence are forced to put aside their differences when they realize that their students are at risk from these monsters. But when a group of Demon Slayers, led by Tanjiro Kamado and his sister Nezuko, arrives from Japan, the two martial arts legends quickly realize their skills are no match for these creatures. With the help of the Demon Slayer Corps, they must train their students to harness powerful techniques known as the Breath Styles, blending their karate with new, otherworldly abilities.
However, Terry Silver, ever the manipulator, sees an opportunity to use the demons to his advantage. Seeking ultimate power, Silver strikes a dangerous deal with an Upper Moon Demon, gaining supernatural abilities that make him even more ruthless than before. As Cobra Kai becomes a breeding ground for demon-enhanced warriors, Daniel, Johnny, and their students must choose: will they embrace the power of the demons, or fight back and defend their world from a threat that could destroy everything they know?
