The Princess of Convenient Plot Devices, Vol. 3 (light novel) — Mamecyoro

After seeing Rust Byrne's startlingly familiar face forces Octavia to relive a terrible memory, she finally gathers her wits. However, the junior ball isn't over yet. There's no time to think about alternative (fake) boyfriends, because anti-royalists have infiltrated the party, and their targets are Octavia and Sil! Never mind her own safety -- Octavia must protect her OTP. She races to Sil's side, but will she make it in time?!