Nanachan was recruited for a job where she would simply be observed masturbating. She is made to allow a penis to approach her, gradually permitting it to touch her bit by bit. As the process unfolds, Nanachan slowly becomes interested, eventually sucking thoroughly on a penis coated with aphrodisiac, and experiencing sex for the first time. This relationship, progressing in a natural flow, holds the power to draw out the true feelings of both parties.