Akane Tsuda (28), who works in the product planning department of a major electronics manufacturer, has a smooth career and is well-liked by her colleagues. However, her personal life is a disaster! Her room is a complete mess, and she has terrible drinking habits. In a drunken stupor, she impulsively buys a household robot. Later, what arrives at her doorstep is none other than an adult-use android named Nadeshiko...?

Akane sighs as she heads home earlier than usual. And no wonder—since the other day, an illegal adult robot named “Nadeshiko” has been staying at her house! Since Nadeshiko, who just arrived, doesn't have any underwear, the two head out to buy some together. Once they do, Nadeshiko goes to change in the bathroom, but she doesn't come back for a while...?

Akane jolts awake from a nightmare where her workplace discovers she'd bought an illegal romance robot named Nadeshiko. The very source of her worries, Nadeshiko, was apparently sleeping soundly right beside her. Hmm? Come to think of it, robots don't sleep, do they? Is she out of battery? As Akane thinks this, she manages to charge Nadeshiko safely, but then she couldn't figure out how to restart her...?

Seeing Akane exhausted from her grueling work, Nadeshiko offers her a regular massage. Following that, Nadeshiko asks Akane to perform the “Master Authentication,” but Akane refuses the request. Master Authentication means becoming Nadeshiko's owner, but Akane says Nadeshiko feels too human to be treated like a tool. How will Nadeshiko reply when Akane tells her she wants to start as friends first...?

Akane is on her way home. Troubled by how deeply she's becoming bound to Nadeshiko, unlike before, Akane feels grateful that the lights are on at her house, that someone is there waiting for her. And the one who greeted Akane upon her return was Nadeshiko... wearing nothing but an apron?

Akane gets an invite to an anonymous online get-together exclusively for Romanceroid owners. Though uneasy about the anonymous email, she decides to attend, thinking it might reveal Nadeshiko's secret. What awaited Akane, filled with apprehension, was a gathering of owners dressed in fairy-tale-like animal costumes—a dog, a rabbit, a bear...?

Akane (and Nadeshiko, who came along out of concern) stays at a leisure hotel during a business trip. While enjoying the large bath, big bed, and stylish meals unique to leisure hotels, Akane braces herself for “that sort of thing” with Nadeshiko... but nothing happened at all! Still feeling frustrated that nothing had happened, Akane drifts off to sleep, when suddenly, she hears the TV on...?

One day after consecutive overtime shifts, Nadeshiko worries about Akane, who comes home late as usual. But before Akane could even reply, she collapses at the front door. Even though she woke up, Akane had regressed to infancy (?) due to exhaustion. Nadeshiko tries every trick in the book to nurse her back to health. However, mistaking Nadeshiko for her own mother, Akane begins acting clingy toward her...