The world is in the hands of humanoids who are called hIE as they operate most parts of the society. One day, a seventeen-year-old young man named Endou Arato meets an android that goes with the name Lecia, and he signed the contract to be her owner. Lecia looks exactly like a human but possesses an extremely powerful intellect. It is one of the five humanoids with intelligence surpassing that of human beings. Each of the five humanoids has their own reasons to fight each other, in order to acquire their opponent’s ability. The human adults could only look on as they fight. Meanwhile, the human youths are trying to approach and forge bonds with those humanoids. The route to future lies in the relationship between humans and humanoids. What attachments would those advanced robots have to the humans? In the era where convenience prevails, humans have no idea what is truly important in this world, and it’s precisely in this environment when Arato meets Lecia, who display far greater kindness than humans. How would this affect the future of humanity?