A kitten, abandoned and left for dead along with his siblings, is taken in by Tomu Kusanagi, who nurtures him and discovers that the tangerine cat he so adores is actually a genius who can talk, walk, read, and has even acquired a taste for liquor!

Kanenone Gakuen is an all-male boarding school located in the countryside of Japan. Although an all-male school is nothing new, life can become quite difficult when there are no female students for miles around. In order to help the psychological health of everyone involved, the school board has decided to try and merge with the nearest all-girl boarding school in order to become co-ed. The boys of Kanenone are more than thrilled at the prospect, and the girls are curious as to how interesting school life might become if there were more boys around. Before any serious decisions are made, the girls have been invited to stay at Kanenone for one month as a test. Green Green follows Yuusuke Takazaki and his naughty room mates called the Baka (Idiot) Trio, and their ability to talk to the girls without making complete fools of themselves. But as soon as the school bus with the girls arrives, things become weird, hormonal, and hysterical. In particular, a girl named Midori Chitose leaps off the bus and immediately embraces a very confused Yuusuke. Is he a natural ladies' man, or do the two of them have a shared history that he is not aware of?

Momoko is a high school student, trying to live up to her older sister Sakura. Sakura works in an office along with many other co-workers. The two sisters, and their friends, experience the everyday hardships and situations of being a woman. (Source: ANN)

Mikage and Tomomi Matsunaga are Miracle Girls: they have a telepathic link with each other and can teleport when they link their little fingers. Tomomi is a sports star and has a boyfriend called Noda. Mikage is the smartest student in the school and is in love with her sempai. He moved to London to study but they still kept in touch, that is until a selfish princess called Marie decides that he should come with her back to Diammas. Back in Japan the twins are having various problems of their own. But they soon realise that there is a link between Marie, an ancient legend, and a girl they know called Emma. (Source: ANN)