Hotori: Tada Saiwai wo Koinegau

Heartwarming dramas. Take place when robots are being made to replace and fulfill role of deceased people. Provided with the artificial memories of real people (and also provided with something called "emotion"), they slowly build relationship with people.  

Both movies alternate between being heartwarming and heartwrenching, putting difficult moral decisions in the hands of children. In both settings, robots are commonplace, and both movies deal with the ethics of creating and interacting with sentient robots - in Hotori, the main character is a robot created to resemble a couple's deceased child, while in Metropolis, several of the many robots that make up the city's slave underclass are clearly as intelligent as the humans around them, and robots that look like humans are illegal. Both also have slice-of-life aspects as their young characters explore the worlds around them. Though both movies feature very young major characters, they are not specifically aimed at that age range and might be too violent for some children. read more 

Both describes relationship between people and androids and the progress of artificial intelligence of male lead during love/friendship 

Both are about the relationships between robots and humans. very touching:) 

Sci-fi stories about robots and AI. Both have a considerable amount of drama, as well. 

Both based on screenplays that won the Animax Taisho award. 

Both are taken from scripts written by complete unknowns in the anime world, and have been adapted into anime form by virtue of them being winners of the Animax Taisho award. 

Both are based on screenplays that won the Animax Taisho award. 

Both are heartwreching tragedy themed series, set in similar surroundings and with similar characters. The story is narrated from the young male lead's point of view, who becomes fascinated by a sick girl who rests very near to him. The male leads are in similar contrast to the girl in that they aren't in prime health, but have a future in front of them and know when they will leave their hospital surroundings, while the girl is, in each case, clinging to her memories, trying to live as best as she can under her conditions in the now, and awayting the inevitable death. For the girl, the boy becomes both her escape and her tie to reality. But despite the similarities, they both are distinct series with characters strong in their own right, with different motives. Both series are shoujo, meaning they are strongly focused on humans and emotions. Hanbun no tsuki is longer, but as far as series go, it's still short. Hotori and Hanbun no tsuki are very close to each other in plot, theme and execution. If you liked one of them, you'll almost certainly like the other. read more