My Black-Bellied Boyfriend - Chapter 4

Three years ago, in the land of Reinbulk, a Legendary Hero was summoned in the Kindom of Leezalion and he succeeded in repelling the Demon King. Now, five students are summoned back into Reinbulk by the Kingdom of Luxeria to fight against the Demon King and the demon army. Unlike the other heroes, Yashiro Yuu has no magical affinity and the Luxeria Kingdom has no intention on acknowledging his existence or returning him to his world.

Reincarnated without memories, given a second chance as a chimera with a limited lifespan. Leon struggles through his strange new life. He attempts to improve his dungeon and evolve himself to live longer and become the strongest Dungeon Master—no. The Dungeon Overlord.Helped by his Dungeon System: the mysterious Ifrit, Zafira a Level 100 Succubus Queen, and his band of trustee goblins. Leon aims to overcome his limits, survive and reach the pinnacle of the world. Whether through trade, domination, or tricking the hero's beautiful party members into becoming his private mercenaries.Leon will face the weakest and strongest beings in the magical world of Umbra and surpass all!

“How do you treat ants? Gods will treat you the same!” – Yuan Chenfei.

On this day, Gods finally appeared.
Not for destruction, not for slavery, but just for playing a game…

- Description from Novelupdates

One scam package,That's all it took to drag the 17-year-old Cail into the world of the void....He thought he had ordered a limited-edition sneakers. But what came was a shady-looking package on his front gate. It smelled like rotten egg and sulfur. Inside the package was a strange box.It's filled with eccentric junk. They looked very intricate and mysterious. He thought, “I probably got someone else's package, a package from someone that was very interested in mysticism.”An old coin, a cracked compass, a ring with an ugly center stone, and some other weird looking trinkets.So he did what any broke student would do:He sold it. He figured someone might want them for cosplay or something. Well, except the gold-rimmed glasses that seemed to fit him very well.“Damn, I paid 7,000 nu for that sneaker; I better get something out from this scam package.”Then all hell broke loose. Strange people started approaching him.People brought that junk. Very strange people wearing suspicious get up trying to buy those stuff in the sketchiest manner possible.As he kept selling, he realized that the box was refilling, it seemed to have an endless supply of those strange stuff. Those people called it 'artifacts'.Then one day he woke up with a strange tattoo on his arm; inside the tattoo was an independent space containing the box. It is basically inseparable from him.“I didn't ask for any of this to happen. But now, strange people come to me with desperate offers. Money, memories, and even soul.”He's just trying to survive high school while earning some money!He had no idea what was going on, but apparently, this thing that he got? It's not just an artifact. It's a contract.As Cail navagates school life, part-time jobs, and otherworldly clients, he starts asking the real question:When did I become an artifact dealer?!By day, he is just an ordinary student, a NPC character.And by night? He is The Dealer. Selling ancient items and dealing with people that he probably shouldn't be talking to.“Since I'm already in this mess, might as well profit off of it.”