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.
Sensei and the people at the 
Shrine won't tell me anything.
Sensei und die Leute am Schrein wollten mir nichts darüber sagen.
El maestro y la gente del 
Templo no me dicen nada.
Nadie me cuenta nada, ni el 
maestro ni la gente del Templo.
Le maître et les gens de Sanctuaire 
ne voulaient rien me dire.
O professor e o pessoal do
Templo não me diziam nada.