Twisted Kivotos, A place where Shiroko(Terror) was before came to main timeline.
(This is alternate timeline in BA, Kivotos is now mostly abandoned and most of students in Kivotos is now infected by chroma turn into a twisted monsters but some of them still can act like normal….but remember, it fake….but there still some students that can manage to survive to see tomorrow day by day, many of academy is now abandoned too and Sensei is currently coma for 100 days already, survive and maybe you can Create a miracle to change destiny or eventually lose and become one of those chroma twisted monsters…)