Sumire leads a busy life working at a magazine editing production company. Burdened by work stress, she brings tasks home and continues laboring late into the night, accumulating exhaustion day after day. One day, her younger brother Nozomu invites members of his film club to their house, starting a filmmaking retreat. Seeking to relieve her stress, Sumire sneaks into the hallway late at night and seduces one of her brother's friends. Right there, she subjects him to relentless orgasm denial before taking his virginity. Unsatisfied with just one, Sumire proceeds the next day to involve the other friends—and eventually her own brother—claiming each of their virginities as the story spirals deeper.