The movie Killer Rivalry starts with the two volleyball teams, one led by Anika and the other by Charly, preparing to face off against each other in the state championships. Anika and Charly have a long-standing rivalry, both on and off the court. Every year, the teams pull pranks on each other, but this year things start to get increasingly dangerous.
After Anika's volleyball partner is found dead, Charly becomes the target of some extreme pranks. She starts to suspect that Anika is behind them, but Anika denies any involvement. Charly's teammates also start to act suspiciously, making her feel even more isolated.
The situation comes to a head when Charly and Anika find themselves trapped in a remote cabin, tied up and unable to escape. It soon becomes clear that they are being targeted by someone who has it in for both of them. As they try to figure out who is after them, they must confront their own personal issues and the longstanding tensions between them.
The tension builds throughout the movie as the two athletes struggle to survive while also trying to uncover the identity of their assailant. Along the way, they must face their own fears and biases, and learn to work together in order to save themselves. Ultimately, the movie is a thrilling and suspenseful tale of two young women who must overcome their differences and work together to survive a deadly situation.