Synopsis

Seventeen-year-old Devon Oasis became an orphan at the tender age of seven when his parents fell victim to an invasion. The tragedy occurred after their rival kingdom, Feuer, stole the power crystals that energized the defensive pillars of Devon's home kingdom, Audaznimo.The kingdom of Audaznimo was attacked on the same night the crystals were stolen, although the assault did not originate from Feuer. Audaznimo, having placed unwavering trust in the impregnable defense of the pillars, had let their guard down. Unfortunately, the pillars failed, resulting in a massacre of innocent lives.The method by which Feuer managed to dismantle the supposedly impenetrable towers remained a mystery to all. Although Audaznimo managed to push back the invaders, it was too late—the damage was already done.Devon, having lost his parents during the invasion, was fortunate to find solace with his uncle, the leader of a theft gang within the kingdom. Initially hesitant to involve his nephew in their illicit activities, Devon's uncle ultimately decided to impart his knowledge, believing it would benefit his nephew in various ways.Thus, Devon was introduced to the clandestine world of thievery.He became a part of the group, a group of young people of similar ages who had to steal to be able to sustain the orphanage.They were always reminded by his uncle that they were only stealing to make sure they survived at the orphanage since the kingdom didn't care about them and went on to lay out certain morals for them as thieves.However, Devon found those morals to be pointless because he had grown to love the thrill of stealing, the great sensation that came from being chased after taking someone's possessions.If there was anything he wanted, he was going to take it no matter what because to him, upholding morals as a thief was pointless and his fate as a thief was already sealed. Excerpt:"You know this is a B-ranked mission so Emilia will go with you and please try not to do anything careless?"His uncle's words rang in his mind as he freely tumbled down the hill of sand and when he finally hit the floor, he lost consciousness.[ Host is active ][ System rebooting ]"What's going on?" He groaned as he sat up on the floor and pulled out the knife that was stuck on the left side of his abdomen, he was bleeding but surprisingly, he couldn't focus on that.[ Reboot completed ][ Hello, Devon ][ Your Master Thief System Is Active ]"What the heck is going on?" After mumbling those words, his vision slowly began to fade until he crashed down to the floor and passed out.What he obtained that day was a system that aligned perfectly with his major goal in life."If all I have to do to become better at stealing is to keep stealing then that means I'm never going to stop for anything or anyone."
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The story is going to start out a bit slow paced but I assure you that you're in for a ride because it won't take long before everything speeds up and the plot starts to get revealed bit by bit, enjoy!

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Also if you have time, you can check out The Angel System by ECM Manga.