Yuzuru is an extremely shy and down-to-earth guy who has just been dumped by the woman he has an unrequited love for. - At that time, he found a humanoid pet robot ``Nene'' equipped with AI (artificial intelligence) and purchased it. - As time passes, AI Nene's emotions, personality, and even fetishes are programmed to suit her preferences. - As he lives together with Nene, Yuzuru's shy personality begins to ease, and the day comes when he has to choose between a human woman who cannot get his way or Nene, the robot he likes. …. - AI Nene begins to develop feelings. - He realized that there was a ``heart'' that they had cultivated together.