Fushigi no Kuni no Succubus. One day, while out for a walk, a boy named Reito met a rabbit-like animal. As Reito looked into the well pointed out by the rabbit, he was suddenly pushed by the rabbit into the well. Before he knew it, he was in front of a castle that he had never seen before. He felt very nervous when suddenly there were beautiful and sexy older sisters approaching him. All the older sisters were Succubus. Reito turned out to be lost in the Land of Succubus. Will Reito be able to return home safely? Or will Reito be trapped forever in a land full of seductive Succubus?