"I just want to serve him, like a robot would a master." For some reason Rai kun has deigned Yuma his robot as children. A title Yuma takes far too seriously, especially now that Rai kun's intentions may be shifting a little. As an orphan living in his house, Yuma only knows how to care for Rai kun's every need. She has no space for her own feelings and emotions! Except those of gratitude and... something uneasy which makes her heart beat really fast!