Three years into marriage, the wife, Tomoko, is sexually frustrated due to her workaholic husband's lack of interest in nightly activities. Caught masturbating by her father-in-law... The sex-driven father-in-law skillfully persuades her, and she eventually gives in. When he accidentally touches her anus, she reacts sensitively, prompting him to relentlessly stimulate the area. Tomoko becomes obsessed with the newfound pleasure of anal sex and finds satisfaction lacking in her infrequent encounters with her husband. Learning this, her father-in-law suggests a lewd anal development...
