Since childhood, Mayuko (pseudonym) became obsessed with anal pleasure after secretly watching her elderly aunt defecate outdoors. Throughout elementary, middle, and high school, she repeatedly engaged in solitary anal masturbation. After graduating college, realizing the abnormality of her sexual desires, she resolved to live a normal life. She chose a career as a teacher, married, and had a child. However, her innate anal masochistic tendencies proved uncontrollable, and she gradually began secretly performing anal masturbation in her elementary school's restroom. A parent, N, accidentally discovered her act and recorded it on video. This release realistically depicts Mayuko being tormented anally in various ways by N, a sadistic man with an anal fetish. Sent to the editorial office of an SM magazine, this video captivated numerous viewers with its shocking content.