Slave System!?

Our MC lives in a world that has no magic or supernatural beings—that is, until he finds a genie in an old lamp at an antique shop that he works at. Where he wishes to go to a world of heroes and demons with a not-so-kind system.
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I am a terrible writer, so expect many grammar errors and/or bad spelling!
PS: Yes, I use a tool to help, but I am broke and only use the free option of said tool!!!