College student Natsume meets married woman Tomomi, who works part-time at a convenience store. Tomomi takes an immediate liking to Natsume and invites her home. Before she realizes it, Natsume is called into Tomomi's apartment, where she's suddenly kissed by the married woman inside the elevator. In that instant, Tomomi slips her hand into Natsume's panties and forces her to lick her genitals. Surprised by the married woman's sudden advance, Natsume gradually succumbs to pleasure. Back in the apartment, the two passionately caress each other's bodies, indulging wildly with double-ended dildos and strapon toys. As night deepens, they part with sweet kisses and vibrations from a vibrator. Caught in this unexpected turn of events, Natsume finds herself drawn deeper into a relationship with the married woman.