Shotgun Shrine.

Mickey shares everything with her younger sister Sky: a bedroom, a school, an illegally obtained .357 Magnum, and a deadly obsession with the perpetrators of one of the most infamous school shootings in history books. When Mickey is raped by one of their bullies, the girls decide to take revenge. They begin to plan a massacre. But Mickey will have to ask herself, is there truly anything to idolize about male violence?