Ikkyuu Nyuukon is a hentai series centered on schoolboy Takahashi, who has a crush on Kaori Asakura, a member of the school volleyball club. When Takahashi's friend Satou, also in the volleyball club, offers to introduce him to Kaori, Takahashi is lured into a trap where he is framed as a panties thief after a brassiere mysteriously falls on him. Caught in this scheme, Takahashi finds himself compelled to comply with the demands of the volleyball club girls, leading to a series of erotic encounters.