共学校で行われた男女混合アナル健康診断　2020春 (2020)

A pharmaceutical company that needs to collect data on the rectum and anus for clinical trials of new drugs. In return for the donation, a co-school accepted an anal medical examination. Men and women are mixed to try to keep it secret, and teachers are forced to participate. Recommended admission for students as carrots, and for female teachers "as a model for students". Thus, a mixed-gender anal medical examination was to be conducted.