The Princess of Convenient Plot Devices, Vol. 6 (light novel) — Mamecyoro

It's the reveal everyone's been waiting for -- the day Princess Octavia introduces her (nonexistent) beloved to the royal family! Even a betrayal and assassination attempt by a trusted royal guard weren't enough to postpone the dreaded event. Despite her best efforts to hunt for a stand-in boyfriend, she's running out of time! The arrival of marriage proposals only adds to the chaos. Now, with her hard-won allies suddenly acting strange and losing their memories, there's only one person left to rely on…