Aah, so that's why.
Feel a bit uneasy with this "naruhodo", as I understand it, is something you say when you get the idea of another person doing, saying something. So I think it can't be "Is that so?" or "Indeed".Is that so?ExtraT-that is...
It's true that I have thought about that too... But...Nagatsuki just said "If it's those two, then won't their interests be surprisingly compatible?"But doesn't onee-sama want to share the same room with Nagatsuki-san?Something like being able to see Nagatsuki's sleeping face every night...
I wouldn't be able to fall asleep... so...