All the moments between Haruka and Takane where life was simpler and happier and they haven't went through Unwilling Roboticisation yet.
Ene's reason to call Shintaro "Master". Why? Because Forgotten First Meeting ensues after her, when she was still TakaneEnomoto, lost a bet after he beat her in a videogame. The deal was that if she lost she would become his servant and call him Master, but Shintaro believed it was too akward and told her to forget about it. Even after becoming a Cyber Girl, she still remembers it and calls him Master because of it.