It's the girls' first day of high school, which introduces a new world that they have to get used to.

It's Osaka time! Osaka tries hard at school - during classes, during gym, and even during lunch. But, is that good enough?!

Yukari and Minamo (or "Nyamo" as she's often called by Yukari) are two close friends who are both teaching at the same school. The girls learn more about them and their past friendship. But, the biggest question is, why does Yukari call Minamo Nyamo?

Kimura, a teacher at the high school, has a weird taste in girls. He seems to have a thing for high school girls! Is he a pervert or is he just misunderstood?

It's finally summer vacation! Chiyo invites the girls over to her summerhouse for fun at the beach. Yukari and Nyamo both tag along as well.

It's Sports Day and the school is holding an athletics festival. Will Yukari's class and Sakaki win, or will Nyamo's and Kagura?