Sister Princess

Wataru Minakami is a high-achieving student who unexpectedly fails his high school entrance exam due to a computer glitch. However, he is unexpectedly accepted to Stargazer Hill Academy, located on the mysterious Promised Island. At his father's request, Wataru is sent to the island, where he is soon surrounded by a dozen charming girls who claim to be his younger sisters. As Wataru forms bonds with his new siblings, he uncovers a deeper mystery surrounding their presence on the island and the true reasons they have come to Promised Island.