Hentai manga slave isekai
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What I was thinking, was that maybe slave trope stems from the subservient(?) female heroine type in harem manga/light novels. Like maids, or such emotionless robotic heroines that blindly listen to the protagonist and just obey his every command, sometimes even addressing him as ‘master’ and such formal terms… and that popular heroine ‘type’ was incorporated into the isekai genre through slaves.
Probably the most notable slave-themed ecchi franchise outside of the isekai field, Sora no Otoshimono was a very popular manga and anime series from back in 2010. It stars a perverted regular high dude MC who suddenly finds himself the proud owner of a beautiful collar-bound android servant who also happens to be a powerful weapon! Other slave-styled android girls soon join the mix and lewd hijinks ensue.






























