Everything has its own story-its own mystery. Belle Allegra Glaria is a wanted assassin who hides behind countless masks. But now she's been assigned to a dangerous mission where she can't wear any mask. This mission was given to her by one of the wealthiest men in the world-Mr. Ascro. He wants her to track down and capture a notorious wanted serial killer. She accepted the mission, determined to prove herself to her agency-and, most importantly, to make her father proud. She's always followed his every command, believing he's the only one who truly loves and cares for her. But will she be able to finish the mission? To catch the killer? To uncover the secrets hidden behind the wanted killer's identity? To discover the mysteries? Most of all, will she be able to make her father proud?