Mari has concerns for her classmate, Saegusa. Saegusa has been hanging out with a boy named Tatsuya, and she wants to make sure Saegusa is dandy. She invited herself over one day, only to be welcomed by Saegusa dressed as a cat and sucking on Tatsuya's dick like it's the most delicious thing in the whole wide world. How will Mari's sensitive sense of smell react to this?
Saegusa, a girl that's willing to show her underclassman what it means to take charges is out to prove to Tatsuya that she's the senior! However, her status as senior matters very little when it comes to Tatsuya.
In an attempt to improve the falling birthrates in the country, the government establishes the “Sex Promotion Program” and sends sex specialist Kengo Kawashima to “educate” the girls of St. Yurigaoka Academy — a prestigious all-girl High School.
Rika has been checking out the Producer’s “beetle” and asks Mika if she’s ever had any experience with it. Little does Mika realize that this “beetle” actually turns out to be something totally different…