A really beautiful anime.
SPOILERS WARNING:
I feel that people view this anime as sicker than it is, (due to just the overall themes as to what goes on) because it revolves around the story of a 16 year old girl and a very smaller child (Shio). I see them as having a sibling-like relationship. Anything else in outside interpretation is disgusting. There are no sexual themes, and the main character is messed up. By beloved, people seem to take that literally. To me, Satou (main character) is more of a mother for this girl. It's like her form of control over a happy life.
Her entire childhood was having sweet things taken away from her. Like innocence, childhood toys, etc by an abusive masochistic aunt. Her form of love is twisted and she only felt bitter empty feelings before meeting Shio. She works to provide for this small child, and locks the door in her apartment to keep her away from the cruel "filthy outside world"
The entire anime is a wild, almost traumatizing ride but it's really heart-touching despite it all.