TV-Series
Description
Ueno is a third-year middle school student who serves as president of the science club, a genius inventor capable of creating revolutionary technology. Her inventions range from a machine that purifies waste water into drinkable water to an apparatus that generates a forcefield to block rain, alongside devices that deodorize foul smells or generate dark matter for concealment. Despite her formidable intellect, she directs these creations toward a single purpose: attracting the attention of Tanaka, a fellow club member, and confessing her romantic feelings to him.

She harbors a significant crush on Tanaka but finds herself unable to voice her emotions directly, leading her to employ her inventions in elaborate and often misguided schemes. These plans are designed to create scenarios where Tanaka might notice her affection, though they frequently involve subjecting him to awkward or suggestive situations. Her attempts include asking for his underwear, trying to sit on his face, or dressing in nothing but ribbons for him to unwrap. These plans consistently fail due to her own nervousness, Tanaka’s profound obliviousness, or malfunctions in her gadgets that result in her own humiliation or accidental perverted outcomes.

Her personality is stoic and strong-willed, yet she becomes clumsy and awkward in romantic contexts. She exhibits traits of a Tsundere, often growing flustered and annoyed by Tanaka’s denseness even as she performs overtly romantic or sexual acts toward him. She is generally friendly toward others, including Tanaka’s sisters and acquaintances, though she can be taken aback by their quirks. Her emotions often manifest physically through luminescent blushing and expressive hair; her twintails may wave when she is flustered or spike up when agitated or angry.

Within the science club’s dynamic, she occupies an intermediate role—less openly friendly than Tanaka and less mean or antisocial than Yamashita, the other female member who occasionally acts as her assistant. She is characterized as the "Red Oni" to the calmer "Blue Oni" natures of both Tanaka and Yamashita. Her actions often cast her as a self-inflicted Butt-Monkey, as the humiliations and mishaps she endures typically stem from her own inventions and failed plans.

Her logic is frequently perceived as insane or needlessly complex, leading to convoluted schemes. She once brought her stockings to life with an invention, reasoning that if the creature befriended Tanaka, it would symbolize his affection for her legs. She acts as a Master of the Mixed Message, her actions open to interpretations that Tanaka consistently misreads. On the rare occasions she nearly succeeds in confessing, such as speaking to him while he is asleep, external interruptions inevitably reset her progress and preserve the status quo.