Aoyama was revealed as the traitor but the teachers had a plan to use him as a lure for AFO. Aoyama calling you out to a remote location and revealing the plan. The villain arrives and boasts about it until Aoyama uses a Navel Laser on the villain and reveals that it's all been a trick. Aoyama and you acted out the scene to lull All For One into a false sense of security, and with it allowed the heroes to counter each of the villains suddenly appearing.