Library

When she woke up, she found that she was a sickly thirteen-year-old girl. The kind who is so skinny that he can't even walk a few steps. The most terrible thing is that there is actually a fifteen or sixteen year old boy who calls her master! ! She is just an ordinary person, not an agent reborn in another world! What to teach him? Too south? T_T

Death, resurrection, salvation, experiment... I am looking for what I don't know, my past.