In a continental republic where a revolution has shattered a millennium of royal and aristocratic rule, a man named Linus Kruger makes his living through deception. He is a swindler, a master of false identities who wears lies like a mask, driven by a singular motivation: money. His life of small-time cons and carefully practiced tricks takes an abrupt turn when he meets a mysterious girl traveling alone. Her name is Chronica.

Chronica possesses a supernatural ability known as Regalia, a power inherited from noble bloodlines. Her left eye is a magical eye that can see through to the soul of another person, allowing her to perceive truth and lies with absolute certainty. She immediately sees through Linus, bluntly accusing him of falsehood. However, instead of exposing him, she makes an unsettling proposition. She has possession of the money Linus has swindled and accumulated over his career. If he wants it back, he must agree to travel with her.

Linus, whose attachment to his wealth outweighs even his self-preservation, reluctantly agrees to this partnership. Their journey is anything but peaceful. Almost immediately, they are pursued and attacked by a mysterious organization called the Knights, a remnant of the old aristocratic order that specifically targets Chronica. The girl harbors a singular, unexplained goal: to reach the sea. Despite knowing nothing about why she is being hunted or why she must travel, the swindler finds himself bound to her on a journey to the coast, hoping to one day reclaim his stolen fortune.

As they cross mountains, pass through towns, and navigate canals, their path is blocked by a series of assassins—otherworldly nobles wielding powerful Regalia abilities. Linus, forced to use his skills in manipulation just to survive, and Chronica, whose own memories begin to fade or slip away, form a tense and fragile alliance. Their first major trial is a brutal fight on a beach, after which they set their sights on crossing the sea. To escape the Knights and find a way to save Chronica, they seek refuge in a foreign embassy. There, they encounter a blind shrine maiden named Anahito, whose offer of assistance may lead to a promised future or into a new trap.

The arrival of new assassins, the mystery of why Chronica cannot read Anahitos soul, and the gradual unveiling of Linus own hidden past threaten to tear the mask from the swindler and erase what remains of the girl. Their strange journey, a blend of high-stakes deception,异能 battles, and a road movie-like pilgrimage, pushes them toward a final truth waiting on a twilight coastline.