Matsuna Koga is a 20-year-old girl attending a teacher's college in Tokyo. This serious literary girl dreams of becoming a music teacher and has such a strong libido that she watches adult videos and masturbates every day in between her studies! When she takes off her clothes, she has an F-cup bust and is so lewd that she smiles when she sees a penis! She shows us the sex she feels in earnest in front of the camera.