Mariko has only been able to love women since she was young. One day, she falls in love with Rinko, the wife of the Kinoshita family, whom she visits as a house sitter. Since she is an employee, she spends her days thinking about Rinko and masturbating to her. However, Rinko, who sensed her lowly feelings for her, shows off her bewitching body to Mariko, as if to ridicule Mariko's innocent feelings for her... Rin with her runaway emotions