Read Isekai de Tochi o Katte Noujou o Tsukurou Manga:
As our humble corporatist Itonami Norio is suddenly summoned to another world, it would look as if he will be sent to a battlefield-- he, however, holds no skill to speak of, and as he is deemed to be useless. He negotiates with The King and receives a plot of land -- an empty, deserted plot of land, with no inhabitant in sight. Norio holds something he couldnt bring himself to tell more.. anyone: The Master of Supremacy, a gift which will grant him the most comfortable of lives in this world. Hereby begins the Norio colorful story -- having a mermaid he fishes declare herself his wife, becoming neighbors with the Undead King, this is his busy but enjoyable life -- and now a dragon appears ?!