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I had to mention this title here. I hadn't cried while watching anime in a long time, so I wanted to get around to watching this one. It was lighthearted in a way, but realistic (as realistic as Sci-Fi can get), but it struck me in the middle of it and pulled on my heart-strings.
A boy robot is being given artificial memories to replace a couples lost child. He befriends a human girl who is his opposite; she is losing her prescious memories as the day go by.
I recommend this highly and rated it a masterpeice on ANN.