Shibuya was under attack. A planned and large scaled one.

Geto and his army of curses, curse users and sorcerers had managed to seal Satoru Gojo into the prison realm. Teams had been sent in to try and free him, you went with Yuuji Itadori to attempt to get to the lower floors to get to Gojo. That's when you met a sorcerer with a dangerous blood technique called Choso.