Chigusa is the nurse at the all-girls boarding school. She came along on the trip as the girls' supervisor. The Baka Trio, especially Bacchi-Gu, are enamored by Chigusa's beauty and her E-cup breasts. Although she should be keeping the girls in order, Chigusa is very easy-going and actually encourages the girls to flirt with the boys.    Source: Wikipedia

Kanenone Academy was an all-boys high school isolated from the world by mountains and hills. Yusuke Takasaki, the average 11th grader, led a normal life in the academy until the academy announced attempting for co-ed, and high-school girls were being transferred for the summer semester.
 
(Source: Anime News Network)

With the integration only a half a year away the school prepares for the last segregated semester and the girls are back. Midori plays the matchmaker, from the future, and visits Yuuske and Futaba in their dreams encouraging them in their relationship which finally comes to a conclusion.
 
(Source: Anime News Network)

Hanaoka high school is an all girls' school, and the girls were pretty excited when they heard that boys were admitted into their high school. Smart and elegant boys, that's in their fantasy. However, in reality, the boys who were actually admitted are from the countryside and not smart at all, leave alone being elegant. And in fact, two of them are dirty perverts...

These are DVD specials, which include some extra footage and music videos; 
Character DVD #1 - Midori &amp; Reika 
Character DVD #1 - Midori Music Video 	 
Character DVD #1 - Reika Music Video 	 
Character DVD #2 - Futaba &amp; Chigusa 
Character DVD #2 - Futaba Music Video 	 
Character DVD #2 - Chigusa Music Video 	 
Character DVD #3 - Sanae &amp; Wakaba 
Character DVD #3 - Sanae Music Video 
Character DVD #3 - Wakaba Music Video

Chigusa Iino