What if Mai wasn't completely human... or human at all? What if she wasn't even supposed to live on earth? Escaping the fate that she detested, she was allowed 18 years as a human. Now that 16 years have passed, her nerves started to get to her. And to top things off, a man keeps showing up during the middle of investigations, begging her to return.

After the ending of Ka, another force attacks, kidnapping Mai and killing her fiancée, she has no clue to what happened to her brother. Her adoptive 'parents' bought her off the slave traders, saving her from an unknown fate. She hid her past from everyone she met, even the SPR gang. What happens when something happens to force her to reveal who she truly is?