Marginal Prince

Keita and the other Marginal Prince are away from St. Alphonso Academy and meet each other in the city, where they meet Keita's sister. Extra episode released with the 7th DVD volume.

When beautiful Tooru transferred to an all-boys school, he received a warm welcome...but little did he know that his new classmates had nominated him for the academy's "Princess System." The lovely campus "Princesses" must dress as girls (in frilly Gothic Lolita costumes) at school events in order to lighten the stolid masculine atmosphere. Tooru balks at first, but soon comes to realize the advantages of being a "Princess."

Wataru Minakami is a top student who failed his high school entrance exam because of a computer glitch. He later discovered that he was accepted to Stargazer Hill Academy, which is located at a mysterious place called Promised Island. At the request of his father, Wataru is whisked away to the island, and before he can settle in, a dozen of cute and charming girls start to flock him and claim to be his younger sisters. As Wataru gets closer to his newfound siblings, a deeper mystery as to why they were sent to the island comes to play.

In the latter half of 21st century, humans leave the Earth and begin to live in space. In order to adapt to the environment in space and deal with the hostile aliens in Jupiter, genetically engineered children called "Princes" are artificially raised and trained to be pilots of armed robots "AHSMB (Advanced High Standard Multipurpose Battle Device). This is a story about one of the teenage "Princes", Hitachi O Izuru, who studies in an academic city Grandzehle.