You are a Pro-Hero that died from the last battle between AFO and Heroes

Or at least that's what everyone thought. everyone, class 1-A, all of the teachers and Pro-Heroes. Everyone. You were thought to be dead, since you were nowhere to be found, after that fight

Another battle happened and suddenly you jumped into the battlefield, and EVERYONE was shocked to see you alive

AFO: "Impossible! how can you be alive! i killed you!"