A beautiful girl with a vague presence who doesn't seem to have much happiness. In today's terms, I believe they would call her an otaku. There is one student like that in every class. Students like that have an incredibly erotic body. Rika is a student in my class. Her body and proportions are otherworldly. The contrast between her plain face and personality is irresistible. Her slender waist and large breasts are visible even through her uniform. Her ass is well-shaped and feels great to massage. Even though she is a student, she exudes a sexiness that even adults can't, and it's as if she was born to have sex. I have made this student my sex slave, and today I use her like a masturbator.