Legends tell of a mysterious ancient kingdom hidden deep within a forest in the far west. The citizens there worship three sacred artifacts to pray for peace. Each possesses immense power, and claiming even one would be enough to conquer the entire world. Ambitious warlords relentlessly infiltrate the woods in attempts to steal these treasures, but without exception, they are all driven back by a rain of sharp arrows, ultimately returning without success.
The artifacts are protected by a Squad known as the Starry Guardian, led by their captain, Luna. Upon coming of age, Luna swears an oath to dedicate her life to defending the sacred treasures. Her obsessive, grueling training makes her the greatest archer in the ancient kingdom. Luna firmly believes that no matter how dire the situation, as long as she has her longbow in hand, she can neutralize any threat.
Days of peace never last for long. A toxic arrow suddenly pierces through the darkness, its tip reflecting a glint of starlight that blinded the eye. "Enemy incoming! Watch out!" Even with Luna's prompt warning, her subordinates fall one after another. Luna swiftly draws her bow and fires into the distance. As a speck of cold light vanishes into the endless darkness, a muffled groan echoes back to her ears. Under the cover of night, no one can rival Luna.
She quickly rallies her remaining troops for a counterattack, effortlessly wiping out the foes hiding in the shadows. However, the sudden shift in the enemy's strength gives Luna a terrible sense of foreboding. She rushes to where the artifacts are kept, only to catch a glimpse of the enemy's back as they prepare to snatch the final one, the Ancient Guardian.
Enraged, Luna launches a furious assault on the mysterious invader. Her relentless barrage forces the thief to momentarily abandon the Ancient Guardian, but she soon realizes that her attacks are completely ineffective. The enemy effortlessly deflects every single one of her arrows. This is the defensive power of another sacred artifact, the Moon Stone.
Seeing that her foe is about to escape, Luna locks her eyes on the Ancient Guardian... Releasing a radiant arrow powerful enough to pierce the very heavens, she sends the mysterious enemy crashing heavily to the ground. By drawing upon the artifact's power, Luna finally manages to pin the thief down.
Just as Luna closes in to deliver the final blow, a thick cloud of poisonous smoke engulfs them both. Before losing consciousness, the last thing Luna sees is the enemy fleeing into the night with two of the sacred artifacts. The very night vision she once prided herself on now serves only to bear witness to her disgrace.
When Luna awakes, she's consumed by overwhelming shame. Her own negligence and arrogance had cost them two invaluable artifacts. Even if the King doesn't punish her, she insists on answering for her failure with her fe. "Since you feel that way, then go and recover the artifacts. Consider this a chance to redeem yourself."
And so, for the first time in her life, Luna leaves the familiarity of her forest. Armed with the Ancient Guardian, an artifact specially granted to her by the King, she embarks on a journey to recover the artifacts and seek revenge. She swears a solemn oath to drag that mysterious enemy back to the forest to face justice.
To gather information, Luna chooses to set up her base of operations in the largest, most powerful Governor's town in the wilderness.
"I'll help you out until I recover the artifacts. I definitely won't let my guard down again this time."