Akane Satomiya and Aoi Satomiya are sisters who go to Hamazawa High School. However, older sister Akane is the homeroom teacher and younger sister Aoi is the student. To make the matter more complicated, Aoi is tall and sexy while Akane is small and cute. Their behavior is questionable, but full of sisterly love! In addition, there is another teacher who is a little too full of her looks, and a class rep, a beautiful girl, who is dedicated to karate. Together, the four of them spend some really fun times in school!

Interesting stories seem to be happening all around a girl named Fuuka, although she isn’t involved in any of them herself. From a man who comes back to town after 4 years and is greeted by the daughter he didn’t even know he had to the man with the crush on his waitress – all that they have in common is that they happen when Fuuka is there to witness it all…

Hayakawa Seitarou, fresh out of college, is approaching his first teaching job with great enthusiasm. He's working at an all girls high school, teaching a special class that only has 8 students. To his surprise, they're all older than him! His class consists of women who, for various reasons, dropped out of high school and are now trying to get their diplomas. With his inexperience at life and at teaching, it's might be difficult to get them to take him seriously. But how can he successfully guide these old "high schoolers" to finally graduate, if he lacks the confidence to establish his credibility as their teacher? He's going to have to find a way to do both, or his employment won't last past the year.