I work with my mouth! / I work with my voice!

Before you is an ecchi comedy about voice actors voicing hentai. The main heroine, 16-year-old Aoyagi Kanna, decided to get a part-time job, but found nothing. Seeing the hopeless situation Kanna found herself in, her older sister decides to offer her a job at her erotic game studio as a voice actress. The offer seems to interest our heroine, but how can she voice such games without the slightest idea about intergender relationships?