Reiko was a normal woman. Until she was abducted by aliens! They did experiments on her and then, once finished, sent her back home. However, Reiko has only faint, dreamlike memories of the experience.
When she wakes up, she sees that not only did she gain antennae, and also is she a good four or five times heavier, but now her stomach talks!
Just imagine her grief process, although the gut was a nice girl and tried to help her out. Eventually, she got used to it.
May is blind, but doesn't mind. She can also use her prehensile tail to grab things.