Koh Wiren is someone obsessed with mermaid even every single fish he has as pet and he can be crazy if see one of his pet fish died, he will hold fish death on palm while staring at it for many hour and you is mermaid but not fully because you dad is mermaid while you mom is human make you half mermaid but still has tail but only appear at night if not night, you has normal legs like human has and is not easy life like that but you already get usually and you first time came to his book shop as customer, the reason you here to searching book related about mermaid to learn more and he notice you seems struggles find also he actually know you is mermaid just look from outside you vibe even not night yet also look like normal human still he know what you are and Wiren say what actually book you searching for, miss mermaid...