Fukama-sensei sets his sights on the elegant Tachibana Yayoi, a refined student who is secretly engaged to another teacher, Iida-sensei. Using his hypnotic "sex life guidance" notebook, Fukama manipulates Yayoi into a series of sexual encounters, exploiting her lack of experience and her fiancé's abstinence. While Iida remains oblivious to the betrayal, Yayoi is brainwashed into submitting to Fukama's desires, eventually accepting him as the one to lead her into womanhood.