Hotori - The Simple Wish for Joy(ほとり~たださいわいを希う。~)

At the Personality Plant, robots are being built and slowly outfitted with the artificial memories of real people. Suzu is one such robot, being made to replace the young boy a family has lost. By chance, he meets Hitori, a young girl suffering from progressive memory loss. The two children become friends and attempt to define themselves in the light of their changing memories.