15岁的聪明国中生海神航竟然高中落榜了…… 真是跌破大家眼镜…… 当他还在懊恼不已时，却突然莫名其妙被送进位在希望之岛上的星见丘西学园，已经被弄糊涂的海神航，面对12位自称是他妹妹的可爱女孩，将会有什么有趣的事情发生呢？



【STAFF】

原作 ： 天広　直人
公野　樱子
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