In a world where the illegal sale and purchase of artificial cat-girl "homunculi" is rampant, Bard, the main character, is a military police officer who cracks down on unlawful "homunculus" activities. In one of his raids, he meets a young homunculus girl. Normally, she would have been discarded because she was an abandoned product, but Bard becomes curious about the homunculus and decides to keep her under his custody. Bard takes the homunculus cat-girl home, but suddenly her lewd crest begins to shine...