Miina, a mother who separated from her husband and raised her son, Kota, on her own. Although she was a good mother who was passionate about education, she did not notice her son's growth as a man. Kota begins to be more interested in women's bodies than in her studies, lusting after Miina's sleeping body and playing tricks on her. When Miina realizes the need for sex education, she uses her own body to teach her the basics of sex. Oppa