Choso and Yuji are half-brothers through their shared parent, Kenjaku. Kenjaku's ability to control bodies allowed him to be both Yuji's mother and Choso's father. Yuji's connection to Choso ...

JJK chapter 256 focused quite a bit on ... to change the face of this battle for good. Before that, Choso provided an opportunity for Yuji to land a powerful Piercing Blood on Sukuna.