Set in the future. Dr. Fu is a brilliant scientist on biology and robotics who works for the cold hearted government agent Hawkmoth in building obedient and dangerous android soldiers. As a younger man he lost his wife and young son and since then he's been very lonely so he creates an android but instead of a soldier it's in the form of a young boy he calls Adrien. He's very different from the others because he is more human looking and Fu gives him human emotions and memories using the heart of his deceased son. (Body parts of the dead are preserved in this world)
Dr. Fu enjoys Adrien's company but he soon realizes that because Adrien is android he's immortal. While Fu will eventually die from old age Adrien will not. Not wanting Adrien to be alone when he dies he decides to make another one to keep him company. He wants to give it human emotions and memories so that it can love Adrien but he can't get another human heart so he cuts Adrien's in half and uses the second half to make it human like.
However before Fu can turn the second android on, Hawkmoth discovers Dr. Fu has done and is furious that he has created more loving and human androids. He attempts to take both androids and remove their hearts but Adrien defends himself and his creator. Fu and Adrien escape but Hawkmoth manages to steal the second one. Time passes, when Fu feels his life is ending he makes one last attempt to create a companion for Adrien by giving artificial intelligence to his son's old toys Plagg and Tikki.
Fu dies and Plagg and Tikki serve as guardians to Adrien. Though Adrien enjoys Plagg and Tikki's company he longs for someone more affectionate and loving to him like Fu was. One day he sees an android but this one is in the form of a young girl called Marinette, the first and only female android. Unknown to both Adrien and Marinette, she was the second android Fu made and because she and Adrien share the same heart (Hawkmoth forgot to have her heart removed) they have a connection and share the same senses and feelings.
inspired by movies such as A.I, The Bride, and Wall-e