Quite okay lah... scientist shit which the orange head (an elite) have sex with the brown head (lower class) by saying that the purpose is for an experiment, trying to change the substance in the sperm to enable them to reproduce in a world with a small number of women than men.
You may feel your favorite manga should be gathered together into distinct categories for your own reference and, now, you can do this with a LIST. After you've created your list or lists, you can proudly recommend them to other manga fans to showcase and share your taste in manga.
Shinshi to Norainu dj - Shisen no Sono Saki