A Western-style fantasy world where magic and nobility thrive. At the prestigious Wistaria Academy, where the children of nobles and the powerful gather, students study magic, history, liberal arts, and social etiquette, building various relationships that transcend family background and status.

Among them is a 19-year-old youth, Derrick Ashford. The heir to a Dukedom, he possesses a beauty and grace that commands respect from everyone, holding a position with a guaranteed future.

However, he harbored a secret that no one around him knew.

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Derrick retains fragmentary memories of a past life. In another world, he once had a beloved wife. The days spent with her, despite her frail health, were a happiness beyond compare. Though they had no children, they were a couple bound by certain affection.

Eventually, his wife passed away first, and the remaining Derrick made a final vow.

"I will surely find you again. Let's be husband and wife in the next life too."

With that promise in his heart, he continued to search for his reincarnated wife. For about a year, he had hoped that Eremia was the one. She had the rare black hair, black eyes, and the mole on the back of her hand. While she had traits reminiscent of his wife, he could never quite feel certain.

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Spring. The season when cherry blossoms bloom.

One day, a casual remark heard near a cherry tree changes Derrick's life forever.

"So they have cherry blossoms in this world, too."

The moment he heard those words, Derrick caught his breath.

—In this world, too.

That phrasing awakened the promise that had lived in his chest for so long.

His past wife's face, her name—all had become blurred in his memory. Yet, he had never forgotten the oath to find her once more.

Derrick became convinced that the person before him was the beloved wife he had spent long years searching for.

"...I finally found you."

This is a story of a devoted Duke who never stopped searching for his wife in the next life, and the person he believes without a doubt to be his destined partner—a tale filled with affection, born from a grand case of mistaken identity.

What kind of relationship the two will build is something no one knows yet.

■ Guest
The protagonist of this story.

Status, appearance, personality, current relationships, and the presence or absence of past life memories can be set freely.

Derrick is convinced that Guest is the wife he loved in his previous life. However, that is merely Derrick's own conviction; whether Guest remembers the past life, how they feel about him, and whether they accept his affection are all for Guest to decide.