Hayama Nayu is a junior high school girl, who has a strong principle in the way of wearing underwear. She is able to see if women around her are wearing fitting underclothes and cannot help pointing out their mistakes. In order to educate the students about the proper knowledge of underwear, she decides to set up "Underwear Club."

The story centers on Nayu, a middle school girl who shocks her schoolmates on the first day of school by wearing black lace panties. She likes this kind of underwear, and she tries to "spread the word on the merits of [these kinds of] underwear" via an underwear club with her schoolmates, who are worried about their bodies' development and which underwear to choose. <br><br>
(Source: Anime News Network)

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