Chapter 7:
Kurama, the de-facto ruler of Looking Glass City, tells Koto that their mother is the black rabbit.
Chapter 8:
Kurama has been intellectually curious from a young age, and loved it when his father praised his inventions.  He wants to find what he can do outside of the Looking Glass City.
Chapter 9:
The identities of Doctor Shouko and Fushimi are revealed...
I'm your older brother.
Ich bin dein großer Bruder.
Soy tu hermano mayor.
Soy tu hermano mayor.
Je suis ton frère aîné.
Sou seu irmão mais velho.