Shinjiteita Nakama-tachi ni Dungeon Okuchi de Korosarekaketa ga Gift "Mugen Gacha" de Level 9999 no Nakama-tachi wo Te ni Irete Moto Party Member to Sekai ni Fukushuu & "Zamaa!" Shimasu!

In a world where humans stand at the bottom of a nine-race hierarchy, Light joins the Concord of the Tribes hoping to prove himself as an adventurer. His only Gift, Unlimited Gacha, normally produces worthless items, making him look like the weakest member of the party. Deep inside the Abyss, however, the companions he trusted reveal their true intentions and leave him to die.

With monsters closing in, Light uses his Gift once more and summons Mei, a Level 9999 fighter who pledges absolute loyalty to him. Three years later, the abandoned boy has built a formidable domain in the dungeon and gathered overwhelming allies of his own. He is finally ready to return to the surface, not for acceptance, but to confront the people who betrayed him and the world that treated human lives as disposable.