Shou Sorimachi appears to be an ordinary young man sharing a house with friends, but he is actually an Amazon, an experimental humanoid organism created by Nozama Pharmacy. He escaped from the research institute two years ago and survives by suppressing his innate predatory urges with medicine administered through a bracelet. When that suppression fails and the urge awakens, a tragedy begins to unfold around him. The story explores the tension between his desire for a peaceful human life and the violent nature he cannot fully escape.