can someone pls tell me who is the host of the culling game and why tf they r hosting it

If i remember correctly its geto suguru(kamo noritoshi)

If I am not mistaken the old Noritoshi Kamo planned it as a way to return to the Japan when only the powerful curses and jujutsu sorceress could survive. So, what he is doing is forcefully making people with potential to become sorceress to fight each other and select only the strongest ones.

this was the easiest understandable explanation ever thanks

Thank you!!