The “Amazon Project,” an experiment to grow artificial humanoid life forms, has been secretly performed at a major pharmaceutical company, Nozama Pharmacy. However, due to an accident in the institution that occurred during the study two years ago the organisms have been released into the town. Meanwhile, Haruka Mizusawa, one of the youths from two years ago, is cared for as an adopted child of Reika Mizusawa, supervisor of the Amazon Project. He has also become aware of the changes happening within him. Jin Takayama, an Amazon who hunts other Amazon, has begun behaving erratically as well..