Mariko is a woman who was invited by an acquaintance to join a drinking party with their wife. This gathering brings together women who keep their distance from their husbands, where bold and uninhibited conversations are common. Initially, Mariko remained quiet and listened, but as she grew more comfortable with the atmosphere, she began opening up about her own married life. She expressed dissatisfaction with her husband, particularly that their sex life is too vanilla. Apparently, she once dated a significantly dominant man, which cultivated in her a sensitivity toward deriving pleasure from pain.