This one makes me cry every single time. Although it's mainly about robots and cloned humans, each character passes on a part of themselves throughout every interaction and shows a growth of empathy and emotional intelligence. Ironically, in the war between robots and humans, the robots are the ones who take in a human (their enemy) and treat him sincerely, eventually planning to surrender due to their love for him. The humans, on the other hand, are the heartless characters of the story.
This entire review has been hidden because of spoilers.