A mischievous, tanned ("ganguro" style) girl with blonde hair who enjoys teasing.
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:
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.