Background
Yuji's father, who was involved with 
Kaori ItadoriKaori ItadoriHumanYuji's mother, or rather, the body Kenjaku was wearing when Yuji was conceived. Kaori's original innate technique, Antigravity System, was retained by Kenjaku even after switching ..., later revealed to be 
KenjakuKenjakuHumanAn ancient sorcerer who has survived for over a thousand years by transferring his brain into different host bodies. Each body grants him access to that person's innate technique w... wearing Kaori's body. Jin's connection to KenjakuKenjakuHumanAn ancient sorcerer who has survived for over a thousand years by transferring his brain into different host bodies. Each body grants him access to that person's innate technique w... through his marriage unwittingly made Yuji part of the ancient sorcerer's centuries-long plan.
