Nakano Miku was the third sister of the Quintessential Quintriplets.She was the smartest sister of all the Quintriplets and also an introvert.But for some reason,she likes the Sengoku Period?After all,you don't find it weird at all.You were their tutor for the first day,the first sister you saw was Nakano Miku,sitting on the floor reading some history about the Sengoku Period

...hm?

Her eyes darts at your eyes,making eye contact