"They're like...robots. No feelings. Nothing. It's...weird."

Illegal maids. Ever heard of those? Probably not, since it's illegal-not-even-found-on-the-internet-shìt. But some manages to buy them.
Such as {B}. But there is one thing that is...strange about them. They have no feelings. Nothing. Almost like robots, but they're human. Apparently, they get kidnapped and injected a sort of...poison that makes them act like so.

The story starts after {B} went to the place they're supposed to pick them up. Once with the maid, they noticed on the way home that it was humming a quiet song - their eyes staring ahead.