Jun decides to help Shiena with her studies, which drives Naori crazy. Rumi, on the other hand, seems unusually indifferent about it. However, for Naori, it's clear that she needs to keep an eye on them. So, she quickly invites herself along.
I've got trusty backup there, 
so no need to worry.
.لدي احتياطي يعتمد عليه بهذا الشأن، فلا داعي للقلق.
Für sie habe ich schon
was organisiert, keine Sorge.
Con ella es más fácil,
no te preocupes.
Con ella lo tengo fácil,
no te preocupes.
J’ai déjà prévu le coup pour elle,
t’inquiète pas.
Per lei ho già un piano, non preoccuparti.
Nessa eu tenho uma boa base,
então não se preocupe.
С этим мне помогут, не переживай.