Most likely ONI Team is Miho and/or Anglerfish Team
It is mentioned by Maho that Shizuka is actually aiming for Miho, and Darjeeling also talk to Shizuka about Miho Nishizumi

am i hoping the team oni is team anglerfish and all star uni squad? because yukari (i see a hat with ooarai insignia) is with the repair team maybe in recon mission

I kinda figure out who the oni is ( I read the cauldron event like 10 times now) by solving abit of the information they gave but oni hasnt appeared yet so cant spoil ;-;

yuru camp cameo ?

YASENDA!

also, i wanna try that Scho-Ka-Kola