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While there isn't a single "official" story with that exact title, the phrase usually refers to the subgenre of "Selection" novels (similar to The Selection by Kiera Cass). Since you're looking for a story, here is an original short tale written in that style: The Jade Rose Selection

The search terms you provided— (Imperial, Selection, Flibusta)—point toward a popular trope in Russian-language romantic fantasy: the "Imperial Selection" (where a ruler chooses a bride or groom through a series of trials). These books are frequently discussed or sought after on the Flibusta digital library. While there isn't a single "official" story with

: Navigating a labyrinth that shifted according to one’s deepest fears. : Navigating a labyrinth that shifted according to

"You don't need a wife to decorate your throne," she whispered, her palms glowing with the cold, steady light of the North. "You need a pillar to help you hold up the sky." The "Imperial Selection" had begun

In the heart of the Golden Empire, the bells of the Eternal Palace rang for the first time in a century. The "Imperial Selection" had begun.

: A direct confrontation with the Emperor himself.

When Elara finally stood before Emperor Valerius, she didn't curtsy. While the others offered flattery, she pointed to the hairline fracture in his crown—a physical manifestation of the Heartstone’s decay.