On the first day of middle school, Nayu Hayama accidentally shows her black lace panties during the opening ceremony....

When wondering about which club to join, Yako gets a bit agitated when her mother is brought up. Whilst changing, Nay...

One of the male students, Hiroki Komachi, tries to have a word with Nayu, but ends up getting occupied at every chanc...

Haruka feels down when the boys start teasing her for her big breasts, even ranking her #1 in a 'biggest breasts' cha...

Nayu explains her situation to Keigo. Hiroki then comes over to Nayu's house to apologise and ask is there's anything...

After Kiyono joins the society, the girls become aware of her habit of teasing what's under her skirt in front of boy...

Hiroki's newfound knowledge of underwear is affecting both his concentration and his reputation. Nayu gets a mysterio...

Mizuno has a rather dubious dream about Keigo. The next day the Underwear Society go on an overnight trip to a beach ...

Yako gets annoyed when her childhood friend, Kota, who insulted her flat chest when she tried changing in front of hi...

Kiyono reveals she is going to be a model for her mother's underwear collection, but has a problem with her current b...

As the Underwear Society make preparations for the drama club, they are asked to participate in the performance. Afte...

Haruka feels betrayed by Nayu's announcement and stops being friends with her. That same night, Mizuno's apartment ca...