Yuzuru, an extremely shy and unassuming boy, has just been dumped by the girl he had a crush on. At that time, he finds an AI (artificial intelligence) equipped humanoid pet robot called "Nene" and buys it. Over time, AI Nene's emotions, personality, and even sexual preferences are programmed to suit his tastes. As he lives with Nene, his shyness eases, and Yuzuru becomes attracted to the girl he had a crush on. The day comes when he must make the ultimate choice: a human woman who doesn't do what he wants, or a robot Nene that suits his taste... Before he knows it, AI Nene begins to develop feelings. He realizes that she has a "heart" that they raised together.