Nothing too fancy, it's your typical isekai fantasy adventure series, the only difference is that there's a magic tattoo seal that is applied to all slaves that forces them to obey almost every order from their master, and the only way to break the seal and free a slave is if their master willingly gives them ownership of any type of clothes, a slave can have one and only one garment, usually a ragged loincloth.
So it's a typical isekai, but all slave characters are functionally naked, wearing only a loincloth or in rare cases, panties.
I don't know if i should make it about a guy buying girls with different kind of abilities to help him in dungeon raiding, or about a Japanese girl that was summoned alongside her best (girl)friend and were swiftly captured and enslaved, the two girls were bought by different owners and now our MC have to gain enough money to buy her freedom back, find her friend, who was bought by a tyrannical prince who wants to wage war an conquer other kingdoms, and find a way to return home.
Honestly, i'm more inclined to the latter premise, i can fap to slave girls in loincloth, but i can't fap to bad writting and MC's who don't face any real struggle, which sadly is almost every isekai.
And yes, this pic is completely related to my premise, the artist is Keihh, you can find the full res here:
https://gelbooru.com/index.php?page=post&s=view&id=7752017 