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Last thread i posted something similar, but i got a new sketch and i want to post the actual plot of this adventure/ecchi isekai series.
One day in a fantasy world, two japanese high school girls were summoned, but instead of being summoned to serve as heroes, they were captured and stripped naked to be sold as slaves.
The girls are Monika Tatsumi, who was sold as a gladiatrix, and Aya Nishimura who was sold as a domestic/sex slave.
At the slave market, before being sold, Monika promises Aya that she will find a way to rescue her and find a way home.
There's a problem though, in this world all slaves are branded with a collar shaped magic tattoo that forces the slave to obey every command (with a few exceptions) that their master gives them. The only way to dispel the magic seal is if the master deliberately grant the slave new clothes, the slave is only allowed to wear one piece of cloth, usually a ragged loincloth.
This is more an excuse to have almost naked slave girls everywhere, but the real plot is Monika trying to find a way to gain her freedom, find Aya and figure a way to return to Japan.