did she come back when she turned 18 ? where did she come from ? what is she ? this story has a kind of vampire - ish to it. she licked her skinned knee and it healed instantly ,and at the end they did a blood transfer. i would really like more to this story.
at some point she is planning on eating her and selling her various body parts, remember when she was telling her why she was there for, we all know where this is going to end . not very good for the albino test subject.
you have to watch the anime and OVA ending to see that it is implied that they get together