Ichiro's a sexual tyrannosaurus otaku with a heart of gold who went to another world after interacting with a fantasy game phone app. There, he employed his doujin and eroge knowledge to build a healthy harem which includes the likes of a succubus and an actual shapeshifting dragon lady. Even the princess of the Cat Kingdom set her eyes on him and wanted to make him king, but he refused because he didn't want to leave his girls behind. She didn't take his refusal too well... What is she going to try to win him over?