It was the current future, there was all kind of technology around, Rui was a robot, programmed to not feel any sort of feelings, but he was abandoned by his inventor and now Rui is on his own to take care of himself, until one day, a young man by the name of Tsukasa Tenma, took him in..

“Hah~!.. you finally opened you eyes!”

Tsukasa had hooked up Rui to an charger, smiling softly, but Rui had no idea what was happening

“Who… are you?..”