Manatsu and Sango discuss on what clubs to join, during which, Laura suggests making one themselves. As the two human girls do research for their own club at the school's library, they encounter a stoic bespectacled girl, Minori Ichinose, who does not believe in the existence of mermaids although she likes mermaid stories. Deciding to find out more about that girl, Sango and Manatsu discover that she is a top student in school. However, when they try to compliment her on a story she wrote, Minori, believing otherwise, turns down their praises, due to a past traumatic experience back when she was in the school's literature club...