Twenty-year-old college student Maki Tsuji has always been serious, loves kanji and hopes to pass the highest level of the kanji proficiency test. Her growing curiosity about sex leads her to volunteer for a porn debut. She lights up when she sees a cock in person, and although she has little sexual experience, her exceptionally tight pussy impresses every male performer. She learns fast over the course of the day and even swallows the semen released into her mouth without being asked.