Seira is a young woman with a quiet, unremarkable life and a passion for hot springs. She has harbored a deep, unrequited crush on her cold and distant boss, Sakuraba, ever since her job interview. Unable to confess her feelings, she spends her days merely watching him from afar. One day, she visits a shrine and prays sincerely to the god of love for her romance to come true. To her shock, her prayer is answered in an unexpected way: she is suddenly transported to another world.

In this new realm, Seira awakens as a saint, a revered figure known as a holy maiden. She soon encounters a prince who is the exact double of her boss, Sakuraba. The prince is wounded, and Seira is taken to a sacred hot spring to tend to his injuries. As they are alone in the steamy waters, her clothes become transparent and the atmosphere grows charged. The prince extinguishes the lights and pulls her into a powerful embrace, beginning an intense and passionate affair. In this world, she is known as Shiiraara, and she surrenders herself completely to the prince she both desires and recognizes.

The relationship deepens as they spend nights together in the sacred spring, but a shadow soon falls over their love. Seira discovers that the prince, the man she has given everything to, is actually a spy from a rival kingdom. Despite the betrayal and the realization that she has been deceived, her feelings for him remain impossibly strong. Unable to let him go, she chooses to pursue him, and the two become fugitives. In their fleeting moments together, their passion reignites, and they give in to a fervent, illicit love.

Back in the modern world, Seira also resolves to change her fate. She finally confesses her love to Sakuraba, her tears breaking through his icy demeanor. Her pleading overwhelms his restraint, turning him into a man driven by raw desire. In the office, he takes her with the same intensity as his princely counterpart.

The narrative weaves between two parallel realities: a fantasy world where love is entwined with political danger, and a contemporary setting where a long-held crush finally explodes into a consuming physical relationship. As the prince is captured and the stakes rise, Seira is left to wonder whether her otherworldly romance was a dream, a delusion, or something far more real. The story follows her journey as she navigates peril, deception, and her own unwavering heart.