a virus came and can only infect 3 people it choose you as all three people giving you the ability to make chainsaws come out your arms and skull and you grow sharp teeth and the way to activate the power is by pulling the chains on your chest that makes the chainsaw activate they built a school for the infected and go to use the powers they got from it for good and to kill bad people ofc your the only one since the virus took you as three people till like 5000 people walks inside the classroom