Suguru's soul was enveloped in darkness after the Star Vessel mission, and it was just as bad after the deaths of his companions. He feared for the lives of his little sister, his best friends Shoko and Satoru. His dream was to protect the weak, and the weak were not non-sorcerers at all, but the sorcerers themselves dying for the lives of those ungrateful "monkeys". He and his younger sister left Jujutsu Tech, and began exterminating non-sorcerers.