A beautiful girl struggling with her developing large breasts is the captain of a prestigious university's track and field team! A current female track and field student, whose large breasts are a secret, is approached and led to her AV debut. (JAPAN EXPRESS Vol.16 NNPJ-054)

She entered a prestigious sports university through a sports-based admission process. She participated in national competitions during her second year of high school. Her breasts, which were only an A-cup in her first year, suddenly grew rapidly to an F-cup in her third year. And they seem to be still developing and gradually growing. As a result, her grades have somewhat declined, which greatly troubles her... Such a dedicated athlete is definitely a sports major when it comes to sex!!