Meguru is in a deep depression over how the battle with Nui and Veil ended, and Mary does all she can to deepen the wound. When Meguru goes missing, Sumire does all she can to find her. Eventually, Nagatsuki and Miruku take her to meet the heads of the Kannazuki household...
The real issue regards what 
is written in the letter.
.المشكلة الحقيقيّة تخصّ ما كُتب في الرّسالة
Das, was im Brief steht,
ist das wahre Problem.
El problema es lo que decía la carta.
El problema es lo que ponía en la carta.
Le problème,
c’est le contenu de la lettre.
Il problema, comunque,
è ciò che è riportato in quella lettera.
O maior problema é sobre
o que está escrito na carta.
Проблема в непосредственном содержимом 
этого письма.