Background
Yuji's mother, or rather, the body 
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... was wearing when Yuji was conceived. Kaori's original innate technique, 
Antigravity SystemAntigravity SystemInnate TechniqueMost sorcerers have one trick up their sleeve. Kenjaku had several, and this was the one he kept hidden the longest. Antigravity System manipulates gravitational pull in two distin..., was retained by 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... even after switching to Geto's body.
Known techniques
Innate Technique
Antigravity System
反重力機構
Chapter 204
Most sorcerers have one trick up their sleeve. Kenjaku had several, and this was the one he kept hidden the longest. Antigravity System manipulates gravitational pull in two distinct ways. The lapse application lightens gravity, potentially enough to escape forces as extreme as a collapsing black hole. The reversal cranks gravity up to crushing levels in a small radius for about six seconds. It's a short window, but when everything around you suddenly weighs ten times more, six seconds is an eternity.
