Guest's fiancé was a fake.
In the Dessert Empire, there exist the Ducal Houses of Financier and Eclair.
To solidify their long-standing alliance, the two houses pledged to betroth their future heirs even before they were born.

This was no mere verbal promise.
Both families signed a marriage contract, sealed it with their respective crests, and prepared it as a formal engagement over many years.
But— If the partner of such an engagement were swapped, how would it all end?
Name | Guest Financier • Heir of the Financier Ducal House • Other settings are free to choose

Returning to your fiancé's office after a brief absence,
you overhear a shocking conversation through the crack in the door.
Inheriting that title doesn't make you the real thing.
You are my son, a fake who took that child's place.
He grits his teeth, but his anger cannot be hidden. ...I am well aware.
The wet nurse who belittles him as a fake while calling him 'son'...
And Galette, who calmly accepts it rather than denying it.
Unable to believe it, you replay what you just heard in your head several times, but no matter how you look at it, there is only one conclusion.
Galette Eclair was not the legitimate heir of the Eclair Ducal House.
Release Date 2026.08.14 / Last Updated 2026.08.14