Plunderer - Episode 14 - Young Nana the First Ace

It turns out that Nana could manipulate time, was the first Ace, and things have progressed because her future self sent her a letter into the past.

It seems that Rihito's older brother Tokizaki was the only one who didn't know who the bath peeping tom was. Everyone else knew, but the problem was catching him in the act.