Karen no Fastener

Doora is a girl who often talks about the ocean and claims to be a mermaid. Trance goes to a slave market with his cousin Palfiena, who is worried he will make a bad decision. He becomes interested in a mute girl and buys her despite her concerns. Kianna is a mermaid living in the northern ocean, enjoying a quiet life with her friends until a man arrives with the intent to kill her. Karen always wears zipped clothing and is told by her parents to stop opening them in public. However, when she falls for Rob, he finds and unzips a zipper on her stomach. Selma travels to the Mokumoku kingdom to perform music for the royal family. Though her performance is well-received, she must limit her playing to once a week as promised to her master. The prince, wanting more, threatens to marry her if she agrees to play for him.