Itonami Noria was summoned into another world. However, he did not possess any “skills” which any inhabitant of the other world all held. Evaluated as useless, he was casted out to the uninhabited land. Although appearing to lack any skills at first glance, Norio actually had the special gift “Ultimate Supporter”. Seeking a sense of adventure in another world, Itonami Noria christened himself as Kidan, and decides to cultivate the land. With his ability, “Ultimate Supporter”, he is able to make use to anything in his hand to maximum efficiency, gradually cultivating the land for use. One day, while fishing at the seaside, he caught a beautiful mermaid! She names herself as Pratty, and announces that she shall become his wife for catching her—!?