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No idea. Only the demihuman characters work this way. Nobody gets old old from leveling either. I would understand it better if it were just physical progression, but the added insult of the slave character in question getting passed around from slaver to slaver while being stuck with the mentality of a child is just straight up fucking bonkers. IIRC she even loses the slave crest that binds her to the MC but she insists she undergo the process of being enslaved to him again because it “strengthens their bond” (LOL.)

It’s worse. The MC’s love interest is an enslaved child who only ages up because the MC forces her to fight and “level up.” Apparently in the novel she even regresses back to a child at one point lmao. Nothing weird to see here!

I know fans of this show claim the slavery aspect is super nuanced, but it seemed super sketchy in the anime.