Amane's mother, Shihoko, arrives at the apartment without warning while Mahiru is visiting. Amane asks Mahiru to hide, but Shihoko eventually finds her, and the two neighbors frantically try to correct Shihoko's assumption that they are dating. Nonetheless, Mahiru is touched by Shihoko's motherly kindness. After Amane sees how happy Mahiru is to be called by her first name, he tries calling her "Mahiru" too. From that day on, the neighbors call each other by their first names.
That's our angel! Her brain 
must be made of different stuff.
هذه هي ملاكتنا! لا بدّ أنّ عقلها
بمستوى آخر تماماً
Das ist eben der Engel,
so ein Köpfchen müsste man haben …
On l’appelle pas l’Ange pour rien,
elle pense pas comme nous !
Tipico del nostro angelo! Lei è proprio
 su un altro livello rispetto a noi!
Esse é o nosso anjo! A inteligência
dela é muito superior à nossa.