thanks for the scanlation so far. sadly the majority of english language manga aren't available in europe anymore, even though local publishers here don't license most series anyway. digital versions are a no-go as well since amazon just doesn't let you buy them. so i'm afraid i can't support the series aside from getting the japanese volumes.
regarding the chapter: what's the point of making up a sad backstory just for it to fall apart in the very same chapter?! just don't mention their pasts if it doesn't go anywhere or if they're unable to just have a normal relationship like normal adults could while she still keeps working as the little girl's retainer.