"My first love partner, my first experience was my homeroom teacher." A pure love sexual intercourse drama depicting a secret physical relationship over 10 years that no one can tell. The days of Platonic SEX that I hid in the school and asked for it many times. Even after graduation, when they meet again at the alumni association, they burn up and seek each other at the hotel. I can't forget about Mr. Tsukasa after getting married ...