>>437689
>these were all answered
Not really
>she's cold because her sister
She was cold before that, you can clearly see how she behaves in the OVA. she's only happy when by her sister. even then, she's still a bit nihilistic and unwilling tom put blame on anyone.
>she has a doll fetish because her mother
not really a cause and she's not even her mother
>dolls sucking X
X was never explained
>her other half
hinted that its her sis but not exactly
read the lyrics for the OP.