A tall college student, Kaoru, agreed to appear in an adult video on the condition that she could wear a mask to conceal her face. Still living with her parents, she is summoned to a hotel in central Tokyo for what will be her first and final AV shoot. Though she has a boyfriend, she reveals a deviant side—getting turned on by having sex with men other than her partner. She enthusiastically embraces her first gonzo-style sex scene and gets aroused by toy play while dressed in a short-skirted Chinese outfit. Gradually, her hidden erotic nature is unveiled, contrasting sharply with her usual innocent appearance. The allure lies in this ordinary girl's surprisingly filthy and arousing true self.