Chapter 19:
Koto takes her mother from the Shrine's Holy Grounds to the Looking Glass City.
Chapter 20:
The three siblings enjoy their time with their mother, but...
Chapter 21:
Koto tries to find out the secret of her birth from her mother, but instead she's asked to save her poor father.  With no place for her feelings to go, she takes them out on Myoue.
I don't really get it.
Ich verstehe es nicht.
De verdad no lo sé.
No sé nada de nada, en serio.
Donc normal que je ne sache rien.
Eu não sei de nada disso.