Kain is a story about a blue-eyed boy wandering the countryside. He happens to be in a town controlled by "kidoushi." These kidoushi are people from the newborn country of Ren, who have a machine in their body, giving them power equal to an army.
Ralph, the Tyrannosaurus, is the king of the dinosaurs. However, because of a meteorite's impact, Ralph is sent 60 million years into the future only to possess the body of a honours student, Mikobayashi Kana.
After suffering numerous interstellar wars, mankind has finally formed an interstellar union. However there are still many disputes and wars occurring amongst the members of the union itself.
Tokugawa, the ruler of Japan wants to keep Japan isolated from the rest of the world, however there are those who oppose this decision and plot to usurp Tokugawa's authority. It's the job of one of Tokugawa's bodyguards to stop these evil plots.
It follows the adventures of a male (who seems to change every few chapters) and a short, humorous, but mostly ecchi encounter with the various females he meets, whether it's in school, in the class room, or in the nurse's office.
Gawain lives in a mountainous, rural area where he plays hitting flyers with his friends.
One day, he runs into a strange visitor who demonstrates the king of making balls fly: golf.
Tsutsui Yukitaka was a freshman who had just entered a high school, and he was hoping to be a good baseball player. When he moved to a new apartment, there was a man in the room. He said he was an alien and lost his memory.
Scene: The School Rooftop
Akane Tachibana is a freshman high school student who, despite his talent for basketball, decides to abandon sports clubs due to the pressure put on him by them.
This manga is something of a side story to the Playstation game of the same name, though you don't have to have played the game to understand it. London, 1899: A girl with special powers runs away from the sanatorium, a hospital where she'd been kept.