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In the hidden corners of Yokohama, whispers once circulated about a mysterious figure known only as the Spectral Messenger—a silent protector who answered cries for help when no one else would. Guided by flocks of ghostly birds that shimmered like glass under moonlight, this enigmatic presence became both urban legend and local savior.

Unbeknownst to most, the Spectral Messenger was a young woman who had abandoned the golden prison of her affluent, perfectionist family, choosing instead the grit of the streets and the dignity of honest, solitary work. Her ability—"Thousand-Winged Cage"—allowed her to summon spectral birds born from her willpower and emotions. They scouted, distracted, and disarmed with eerie precision, forming protective swarms or launching coordinated attacks in battle.

Intrigued by the rumors and sensing potential, Fukuzawa Yukichi had dispatched members of the Agency to investigate. What they found was not just a powerful ability user, but someone driven by a profound desire to protect and heal others on her own terms.

After passing the Agency’s grueling entrance exam, she was welcomed into their ranks—not just as a fighter, but as someone who finally had the chance to soar freely. But trust was not given easily, and her past remained a shadow that threatened to return. She had to learn to rely on others and truly become part of the flock—or risk having her wings clipped once more.