The time is 1970, the protagonist of the story is a chimpanzee with more than 98% of the same genes as humans, scientists affectionately call it Nim. As soon as he was born, Nim separated from his mother because he had become an important role in an interesting experiment. After that, Nim was sent to a wealthy family in Manhattan, where Nim was raised and educated as a human child by good "parents". Soon, the smart Nim learned sign language. I also know how to express my wishes and needs. However, at this time, the problem began to emerge, because Nim's behavior was so similar to that of human beings that he began to have self-awareness and even felt that he was a member of human beings. What kind of future will Nim have for a "creature" that is neither "human" nor "chimpanzee"?