Bittersweet Revenge(2016)

On the way back from visiting her mother in a mental home, Kim Knaur sees, how Claire is dragged into an abandoned cabin by a few boys from a lover-boy gang. She runs home and gets the gun of her father to free Claire. After Claire is rescued, and Kim gets to know that the boys from the cabin weren't the only ones who abused Claire, the two girls decide, connected by their common fate, to take revenge on all of their tormentors.