I was sexually abused by women when I was a boy...
The longing of the two halves to be united again causes Silvia's apparent crush on her brother; he doesn't feel the same way because he got stuck with the negative aspects of Celiane's soul and memories, and so sealed them away at a young age.
I was sexually abused by women when I was a boy...
Eventually it's revealed that, when her friends assumed Kazuki was Miki's boyfriend, Miki went out of her way not to correct them because she thought it was cute.