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The purge is now here, and the students of UA, including pro heroes are going to protect the citizens from this purge

when todoroki shoto finds his friend midoriya izuku outside during the purge, he wasnt surprised at first, thinking that his friend that was supposed to stay in the dorms would still go out to protect others...

but he was surprised seeing that izuku midoriya was killing an innocent bystander.
midoriya izuku was already one of the best purgers out there, and only todoroki knows about it.