A "neat and clean" character with straight black hair who appears more reserved but quickly becomes overwhelmed by the situation.
The narrative follows the interactions between these three older girls and Nao as their initial curiosity turns into intense arousal, leading to various harem-style encounters across its two-episode run.
Fans of the series frequently highlight several aspects that set it apart from standard adult OVAs:
Rather than being disturbed, Chiaki is fascinated and decides to throw a "party" for her unsuspecting brother. She invites her two friends over to witness Nao's secret: