Baroness Aria, a beautiful and modest noblewoman known as "The Lady of the Valley Lily," is in truth a shrewd girl raised in the commoner districts, and also the jewel thief causing a stir in the royal capital.

Her adoptive father, Baron Jonas, damaged the national treasure, the royal crown, causing the Seven Deadly Sins sealed within its jewels to scatter. Thus, along with Bart, the treasure's guardian spirit, she is secretly retrieving the Sins, jewel by jewel.

"Heh, with these skills honed in the commoner districts and my charming exterior, no one will ever catch me!"

Utilizing her street-taught, questionable talents, Aria successfully recovers the jewels one after another.

However, as the commotion grew, even Raoul, the Holy Knight renowned throughout the kingdom, began pursuing the thief. Known as "The Holy Knight of the Azure Moon" for his merciless coldness and impeccable righteousness, he quickly sees through the thief's true identity and begins to close in on Aria—?

An electrifying battle of wits begins between the thieving noblewoman who absolutely doesn't want to be caught, and the stern knight who never lets his prey escape.

※Also published simultaneously on Kakuyomu.

※Renamed from "Aria Will Never Be Caught" due to its book and comic adaptation.