After losing her husband, Bi raised her only son, Takahiro, single-handedly. Unable to earn enough money, she offered her body to her boss, Oonuki, to make ends meet. However, the perverted Oonuki was not satisfied with just embracing Bi; he began to take an interest in her asshole. To survive, Bi complied every day as her anus was played with... Eventually, her anal virginity was taken, and she unintentionally reached orgasm. Seeing this, Oonuki sought further excitement and came up with a plan...
