Soul Circuit follows Kairo Ren, exiled after refusing to let his family harvest his soul for their evil purposes. They chained him to a soul-stealing machine, but it could extract only 90% because of his latent power. The remaining 10% left his soul unstable and fragmented, and broke the soul circuit bracer on his left wrist. Now Kairo seeks revenge while recovering his soul fragments, meeting people who help him master his unstable power along the way.