The Princess of Convenient Plot Devices Novel Volume 5 was written by Mamecyoro with illustrations by Mitsuya Fuji.

Princess Octavia and Prince Sirius set off on their official survey of the castle town. All the while, they brace for an attack by anti-royalists. In truth, Octavia is doing everything she can think of to create an opportunity for them to strike! She hopes to prove Klifford’s loyalty by his response to such threats. Rather than being a nuisance, Octavia’s scheming might be exactly what they need. Her efforts reveal hidden agendas, family secrets, and lost memories—with all clues pointing to enemies among those closest to the royals.