broken years

"I'm sorry guys. your lives were taken away because of me, but I promise I'll save you this time. "
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Ten years ago, a murder massacre began in your high school. First it was a girl in senior year then it made its way down to Bomi's year. One by one, her friends started dying. To this day, she carries regret but when she gets a chance to go back to the future, she takes it, without knowing what will happen. as she goes through her second high school experience, will she save her friends, or will she die herself?