* Based on the story serialised in G's Magazine since March 1999.

Twelve little sisters — Karen, Sakuya, Hinako, Marie, Chikage, Yotsuba, Haruka, Rinrin, Mamoru, Aria, Kaho and Shirayuki — cannot stop loving their older brother, Minakami Wataru, in their own way.

Wataru is a top student at middle school who failed his high school entrance exam. However, he got accepted by recommendation into Star Gazers Hill West University located on Promise Island. Shipping over to the island he meets Yamada Taro and Mami on the boat. Just when he wants to get off the boat, he falls into the sea and is saved by Karen, one of his little sisters. But this is only the beginning, another 11 sisters await...

Source: AnimeNfo

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Alternative version: Sister Princess: Re Pure