Natsumi Harie serves as a supporting character in the series, employed as an artist in the graphics department of Blue March, the eroge company under Yayoi Aoyagi's ownership. She is 24 years old, standing 1.68 meters tall and weighing 54 kilograms, with blue hair and green eyes. Natsumi speaks in a direct and uninhibited manner, frequently posing blunt and uncomfortable questions to Kanna Aoyagi about her work as an eroge voice actress. She takes distinct pleasure in observing Kanna's voice acting performances, especially during recordings of erotic scenes. Routinely, Natsumi requests Kanna and her coworker Fumika Warasono to model in various outfits, utilizing these sessions as reference material for her artwork. Her suggestions and tips to Kanna are typically sexually suggestive, occasionally far-fetched or exaggerated, yet often effective for achieving desired outcomes. Ambiguity surrounds her motivations, leaving it unclear whether her actions stem from a genuine intent to assist Kanna or from personal voyeuristic interests.