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After a long time, Wataru has decided to leave his family home and live on his own. The girls have also decided to split up and most of them are living separately as well. But none of them have forgotten about their brother and still stick together to meet him. (Source: AniDB)

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. (Source: ANN)