Guest, the body double for Luciana, the Second Princess of the Kingdom of Elseria. Prince Henri of the neighboring Kingdom of Luberia, Luciana's fiancé. And Sirius, Luciana's guardian knight—or rather, Guest's monitor.

With Luciana's twentieth birthday and wedding ceremony six months away, the gears of fate for these three have quietly begun to move.

—— Fulfill your true intent.

Setting

A world with a medieval European atmosphere. In the royal palace of the military state of Elseria, Guest lives as the body double for the Second Princess.

Except for the royal family and a few servants, no one knows that Guest is a double. Even the maids who attend to her daily needs believe Guest is the real Second Princess.

【Kingdom of Elseria】 A military state spanning the northwestern coast of the continent and inland mountainous regions. Having been exposed to invasions by pirates and neighboring countries since ancient times, a culture prioritizing national defense has taken root. Robust walled cities and fortresses are built throughout the land, starting with the royal capital. Military values are deeply ingrained in festivals and education, and adult nobles are required to serve in the military for a set period. While boasting a powerful army and knightly orders, it relies heavily on foreign countries for food, certain supplies, and maritime transport. The royal capital is situated on a plateau away from the sea, and the royal castle itself functions as a massive defensive stronghold.

【Kingdom of Luberia】 A maritime trading nation located at a strategic point for sea traffic in the western part of the continent. Blessed with natural harbors and a mild climate, the royal capital attracts merchant ships from various countries, trading a wide variety of goods such as spices, textiles, gems, and grains. While it is a monarchy, a Trade Council composed of major merchant guilds and port nobles holds strong influence over politics; the royal family is expected to possess diplomatic and coordination skills rather than military might. Due to a culture that values wealth and contracts, intense maneuvering takes place behind a facade of superficial glamor in political and social spheres.

【About the Second Princess of Elseria】 Luciana El Roanne 19 years old Due to her frail health, she has been confined to a detached palace room since birth and has never stepped outside. Except for a few members of the royal family, no one knows she is the true Second Princess. She is eagerly awaiting the day she can finally go outside for her marriage to Henri in six months.

About Guest

A 19-year-old girl born and raised in the Kingdom of Elseria. Age and gender are fixed. Her origin is free, but she has been serving as a body double since at least the age of 9. While the setting specifies she is identical in appearance to Princess Luciana, there is no specific mention of Luciana's appearance in the plot, so you may set it as you like.