A special class for one person only, prepared for me, who has such a sexual desire that I started masturbating during class and was in danger of graduating. Her homeroom teacher is Mr. Morisawa, a beautiful teacher who is rumored to have had sex with all the boys at her previous school. My girlfriend's teacher puts a chastity belt on my crotch, and if I get a good score on the test, he'll take it off and let me ejaculate, and if I get a perfect score, he'll let me have sex with him. I was so excited that such a beautiful teacher would teach me so much, so I started studying hard with the goal of graduating from virginity...