Nayu shocks her schoolmates on the first day of middle school by wearing black lace panties. She aims to ''spread the word on the merits of underwear'', and help other girls concerned with their development - by opening a underwear club.
Spring. The "season of love" has arrived and it seems that finding himself a girlfriend was harder than Junichi believed. To break the status quo, Junichi's friends have forced him into confessing to the gal, Yame Yukana. However, things do not go quite as he expected. A series of "firsts" begins!