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.
Characters and Voice Actors:
- Main:
Kiyono Amahara
A girl from a rich family who seems to be rather knowledgeable about the seedier side of underwear, and looks down upon Nayu for her naivety.
- Hikasa, Yoko (Japanese)
Nayu Hayama
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.
- Chihara, Minori (Japanese)
Yako Jinguuji
A petite girl with a generally fierce composure. She prefers to keep a tough image, and has a hard time admitting embarrassing things.
- Kotobuki, Minako (Japanese)
Hiroki Komachi
A boy who easily gets embarrassed at the sight of underwear. He has a one-sided rivalry with Nayu on school grades as he always ends up being second to her. He seems to have a small crush on her.
- Satou, Yuudai (Japanese)
Haruka Shiraishi
A busty girl and Yako's best friend. She often has trouble with boys because of them mocking her breasts. Presumed to be a lesbian with a crush on Nayu.
- Yahagi, Sayuri (Japanese)
- Supporting:
Keigo Hayama
Nayu's step-brother who has been looking after her since their parents died. He works as an underwear designer and often gets Nayu to test out his latest products.
- Sakurai, Takahiro (Japanese)
Sae Mishima
- Kodaira, Yuuki (Japanese)
Tamaki Mizuno
A teacher at Nayu's school who becomes the adviser of the Underwear Appreciation Society. She is generally nervous, but admires Nayu for giving her courage. She seems to have a crush on Keigo, who was her senpai in high school.
- Ohara, Sayaka (Japanese)
"Sensei" Ookuma
- Houki, Katsuhisa (Japanese)
Kaori Seto
- Sugiura, Naoko (Japanese)
"Sensei" Takatou
- Asakawa, Yuu (Japanese)
Tanihara
- Nakamura, Yuuichi (Japanese)
Natsumi Terauchi
- Nagata, Yoriko (Japanese)
"Sensei" Tsukamoto
Tsukamoto is a lingerie designer.
- Mayama, Ako (Japanese)
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