Once a popular all girls' school, Ousai Private Academy is now co-ed due to declining birth rates. Takatoshi Tsuda, a boy newly attending Ousai solely because of the proximity to his house, is quickly forced to become the student council vice president and male representative of the school by president Shino Amakusa. Now looked upon as nothing more than a filthy pig by his female peers, Takatoshi must cope with learning about a whole new side of the opposite gender, hearing plenty of dirty sex and period jokes along the way!