I'm wondering, because if it's not, I feel like changing.
Koja and Sonnet are the only teens in their town, Derga. An ancient relic known to the townsfolk as, "The Key", is seeked by a small group of rebell soldiers from the opposing country (Cappidocia [good] and Galatia [bad]).
Sonnet has a secret that she hasn't told anyone, that the Ex-Galatia Soldiers know. They seek her and The Key to open "The Gateway" that leads to the lower levels of Hell. Koja is tasked by being sent out of his hometown (which no one is allowed to leave) to return Sonnet and The Key.
And somewhere in there, I forgot to mention, a war breaks out between Cappidocia and Galatia and Galatia believes that Derga is an HQ for Cappidocia forces.